Dr. Johnson's Publications

Journal Publications (85): [back to top]

  1. Johnson, L., W.E. Berndtson, and B.W. Pickett. 1976. An improved method for evaluating acrosomes of bovine spermatozoa. J. Animal Sci. 49:951-956.

  2. Amann, R.P., L. Johnson, D.L. Thompson, Jr., and B.W. Pickett. 1976. Daily spermatozoal production, epididymal spermatozoal reserves and transit time of spermatozoa through the epididymis of the Rhesus monkey. J. Androl. 15:586-2.

  3. Amann, R.P., L. Johnson, and B.W. Pickett. 1977. Connection between the seminiferous tubules and the efferent ducts in the stallion. Am. J. Vet. Res. 38:1571-1579.

  4. Johnson, L., R.P. Amann, and B.W. Pickett. 1978. Scanning electron and light microscopy of the equine seminiferous tubule. Fertil. Steril. 29:208- 215.

  5. Johnson, L., R.P. Amann, and B.W. Pickett. 1978. Scanning electron microscopy of the epithelium and spermatozoa in the equine excurrent duct system. Am. J. Vet. Res. 39:1428-1434.

  6. Johnson, L., R.P. Amann, and B.W. Pickett. 1980. Maturation of equine epididymal spermatozoa. Am. J. Vet. Res. 41:1190-1196.

  7. Johnson, L., C.S. Petty, and W.B. Neaves. 1980. A comparative study of daily sperm production and testicular composition in humans and rats. Biol. Reprod. 22:1233-1243.

  8. Johnson, L., C.S. Petty, and W.B. Neaves. 1980. The relationship of biopsy evaluations and testicular measurements to overall daily sperm production in human testes. Fertil. Steril. 34:36-40.

  9. Johnson, L. and W.B. Neaves. 1981. Age-related changes in the Leydig cell population, seminiferous tubules, and sperm production in stallions. Biol. Reprod. 24:703-712.

  10. Johnson, L., C.S. Petty, and W.B. Neaves. 1981. A new approach to quantification of spermatogenesis and its application to germinal cell attrition during human spermiogenesis. Biol. Reprod. 25:217-226.

  11. Johnson, L. 1982. A re-evaluation of daily sperm output of men. Fertil. Steril. 37:811-816.

  12. Johnson, L. and W.B. Neaves. 1983. Enhanced daily sperm production in the remaining testis of aged rats following hemicastration. J. Androl. 4:162-166.

  13. Lebovitz, R.M. and L. Johnson. 1983. Testicular function of rats following exposure to microwave radiation. Bioelectromagnetics. 4:107-114.

  14. Johnson, L., C.S. Petty, and W.B. Neaves. 1983. Further quantification of human spermatogenesis. Germ cell loss during post-prophase of meiosis and its relationship to daily sperm production. Biol. Reprod. 29:207-215.

  15. Johnson, L. and D.L. Thompson, Jr. 1983. Age-related and seasonal variation in the Sertoli cell population, daily sperm production, and serum concentrations of follicle stimulating hormone, luteinizing hormone, and testosterone in stallions. Biol. Reprod. 29:777-789.

  16. Johnson, L., C.S. Petty, and W.B. Neaves. 1984. Influence of age on sperm production and testicular weights in men. J. Reprod. Fertil. 70:211-218.

  17. Johnson, L., R.M. Lebovitz, and W.K. Samson. 1984. Germ cell degeneration in normal and microwave irradiated rats: Potential sperm production rates at different developmental steps in spermatogenesis. Anat. Rec. 209:501-507.

  18. Neaves, W.B., L. Johnson, J.C. Porter, C.R. Parker, and C.S. Petty. 1984. Leydig cell numbers, daily sperm production and serum gonadotropin levels in aging men. J. Clin. Endocrin. and Metab.55:756-763.

  19. Johnson, L., C.S. Petty, J.C. Porter, and W.B. Neaves. 1984. Germ cell degeneration during postprophase of meiosis and serum concentrations of gonadotropins in young adult and older adult men. Biol. Reprod. 31:779-784.

  20. Johnson, L., R.S. Zane, C.S. Petty, and W.B. Neaves. 1984. Quantification of the human Sertoli cell population: Its distribution, relation to germ cell numbers, and age-related decline. Biol. Reprod. 31:785-795.

  21. Johnson, L. 1985. Increased daily sperm production in the breeding season of stallions is explained by an elevated population of spermatogonia. Biol. Reprod. 32:1181-1190.

  22. Neaves, W.R., L. Johnson, and C.S. Petty. 1985. Age-related change in numbers of other interstitial cells in the human testis: Evidence bearing on the fate of Leydig cells lost with increasing age. Biol. Reprod. 33:259-269.

  23. Bartke, A., C.A. Sweeney, L. Johnson, D.V. Castracane, and P.C. Doherty. 1985. Hyperprolactinemia inhibits development of Leydig cell tumors in aging Fischer rats. Exp. Aging Res. 11:123-128.

  24. Johnson, L. and H.B. Nguyen. 1986. The annual cycle of the Sertoli cell population in adult stallions. J. Reprod. Fertil. 76:311-316.

  25. Thompson, D.L., Jr., L. Johnson, R.L. St. George, and F. Garza, Jr. 1986. Concentrations of prolactin, luteinizing hormone and follicle stimulating hormone in pituitary and serum of horses: Effect of sex, season and reproductive state. J. Animal Sci. 63:854-860.

  26. Johnson, L. 1986. A new approach to quantification of Sertoli cells that avoids problems associated with the irregular nuclear surface. Anat. Rec. 214:231-237.

  27. Johnson, L., C.S. Petty, and W.B. Neaves. 1986. Age-related variation in seminiferous tubules in men: A stereologic evaluation. J. Androl. 7:316-322.

  28. Johnson, L. and D.L. Thompson, Jr. 1986. Seasonal variation in Leydig cell volume in stallions is explained by variation in cell number rather than cell size. Biol. Reprod. 35:971-979.

  29. Johnson, L., F.W. George, W.B. Neaves, I.M. Rosenthal, R.A. Christensen, A. Decristoforo, H.U. Schweikert, M.V. Sauer, M. Leshin, J.E. Griffin, and J.D. Wilson. 1986. Characterization of the testicular abnormality in 5 alpha-reductase deficiency. J. Clinical Endocrin. and Metab. 63:1091-1099.

  30. Lebovitz, R.M., L. Johnson, and W.K. Samson. 1987. Effects of pulse modulated microwave radiation and conventional heating on sperm production in the rat. J. Appl. Physiol. 62:245-252.

  31. Lebovitz, R.M. and L. Johnson. 1987. Acute, whole body microwave exposure and testicular function of rats. Bioelectromagnetics. 8:37-43.

  32. Neaves, W.B., L. Johnson, and C.S. Petty. 1987. Seminiferous tubules and daily sperm production in older adult men with varied numbers of Leydig cells. Biol. Reprod. 36:301-308.

  33. Thompson, D.L., Jr. and L. Johnson. 1987. Effects of age, season and active immunization against estrogen on serum prolactin concentrations in stallions. Domestic Animal Endocrinol. 4:17-22.

  34. McConnell, J.D., D.K. Stone, L. Johnson, and J.D. Wilson. 1987. Partial purification and characterization of dynein ATPase from bovine sperm. Biol. Reprod. 37:385-393.

  35. Johnson, L., H.B. Nguyen, C.S. Petty, and W.B. Neaves. 1987. Quantification of human spermatogenesis: Effect of age on germ cell degeneration during spermatocytogenesis and meiosis. Biol. Reprod. 37:739-749.

  36. Johnson, L., K.S. Matt, A. Bartke, H.B. Nguyen, and H.T. Le. 1987. Effect of photoperiod on the size of the Leydig cell population and the rate of recruitment of Leydig cells in adult Syrian hamsters. Biol. Reprod. 37:727-738.

  37. Johnson, L. and D.L. Thompson, Jr. 1987. Effect of seasonal changes in Leydig cell number on the volume of smooth endoplasmic reticulum in Leydig cells and intratesticular testosterone content in stallions. J. Reprod. Fertil. 81:227-232.

  38. Johnson, L., J.G. Abdo, C.S. Petty, and W.B. Neaves. 1988. Effect of age on the composition of seminiferous tubular boundary tissue and on the volume of each component in humans. Fertil. Steril. 49:1045-1051.

  39. Johnson, L. and D. Varner. 1988. Effect of daily spermatozoan production but not age on transit time of spermatozoa through the human epididymis. Biol. Reprod. 39:812-817.

  40. Johnson, L. and M.E. Tatum. 1989. Temporal appearance of seasonal changes in numbers of Sertoli cells, Leydig cells, and germ cells in stallions. Biol. Reprod. 40:994-999.

  41. Blanchard, T.L., D.D. Varner, S.P. Brinsko, S.A. Meyers, and L. Johnson. 1989. Effects of postpartarient uterine lavage on uterine involution in the mare. Theriogenology. 32:527-535.

  42. George, F.W., L. Johnson, J.D. Wilson. 1989. The effect of a 5 alpha- reductase inhibitor on androgen physiology in the immature male rat. Endocrinology. 125:2434-2438.

  43. Johnson, L., J.S. Grumbles, S. Chastain, H.F. Goss, Jr., and C.S. Petty. 1990. Leydig cell cytoplasmic content is related to daily sperm production in men. J. Androl. 11:155-160.

  44. Johnson, L., V.B. Hardy, and M.T. Martin. 1990. Staging equine seminiferous tubules by Nomarski optics in unstained histologic sections and in tubules mounted in toto to reveal the spermatogenic wave. Anat. Rec. 227:167-174.

  45. Johnson, L., J.S. Grumbles, A. Bagheri, and C.S. Petty. 1990. Increased germ cell degeneration during postprophase of meiosis is related to increased serum FSH concentrations and reduced daily sperm production in aged men. Biol. Reprod. 42:281-287.

  46. Johnson, L., A.F. Kattan-Said, V.B. Hardy, and W.L. Scrutchfield. 1990. Isolation and staging equine seminiferous tubules by transillumination. J. Reprod. Fertil. 89:689-696.

  47. Varner, D.D., S.D. Vaughan, and L. Johnson. 1991. Use of a computerized system for evaluation of equine spermatozoal motility. Amer. J. Vet. Res. 52:224-230.

  48. Johnson, L. and A. Bartke. 1991. Effects of photoperiod on the rate of in vivo recruitment of epididymal principal cells in adult Syrian hamsters. J. Exptl. Zool. 258:89-94.

  49. Johnson, L. 1991. Seasonal differences in equine spermatogenesis. Biol. Reprod. 44:284-291.

  50. Johnson, L., D.D. Varner, and D.L. Thompson, Jr. 1991. Effect of age and season on the establishment of spermatogenesis in the horse. J. Reprod. Fert. Supp. 44:87-97.

  51. Bartke, A., E.M. Narr, L. Johnson, M.R. May, M. Cecim, J.S. Yun, and T.E. Wagner. 1992. Effects of expression of human or bovine growth hormone genes on sperm production and male reproductive performance in four lines of transgenic mice. J. Reprod. Fert. 95:109-118.

  52. Johnson, L., D.D. Varner, M.E. Tatum, and W.L. Scrutchfield. 1991. Season but not age affects Sertoli cell number in adult stallions. Biol. Reprod. 45:404-410.

  53. Johnson, L., M.R. May, D.L. Busbee, and J.D. Williams. 1992. Effect of age and dietary restriction on daily sperm production and number and transit time of epididymal spermatozoa in the mouse. AGE. 15:65-71.

  54. Varner, D.D., J.A.Bowen, and L. Johnson. 1992. Capacitation and acrosome reaction of equine spermatozoa by heparin. Molecular Androl. 4:81-99.

  55. Johnson, L., P.K. Chaturvedi, and J.D. Williams. 1992. Missing generations of spermatocytes and spermatids in seminiferous epithelium contribute to low efficiency of spermatogenesis in humans. Biol. Reprod. 47:1091-1098.

  56. Johnson, L., S.H. Safe, and R. Dickerson. 1992. Effect of 2,3,7,8-tetrachlorodibenzo-p-dioxin on spermatogenesis and Leydig cell volume in adult rats. Chemosphere Dioxin >91 proceedings.

  57. Silva, P.J., L. Johnson, and B.P. Fitzgerald. 1992. Immediate changes in the hypothalamic-hypophyseal axis of the mare relative to the winter solstice. J. Reprod. Fert. 96:195-202.

  58. Johnson, L., R. Dickerson, S.H. Safe, C.L. Nyberg, R.P. Lewis and T.H. Welsh, Jr. 1992. Reduced Leydig cell volume and function in adult rats exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin without a significant effect on spermatogenesis. Toxicology. 76:102-118.

  59. Chaturvedi, P.K. and L. Johnson. 1993. Architectural arrangement of stages within human seminiferous tubules is related to efficiency of spermatogenesis. Cell and Tissue Res. 273:65-70.

  60. Johnson, L., G.K. Carter, D.D. Varner, T.S. Taylor, T.L. Blanchard, and M.S. Rembert. 1994. The relationship of daily sperm production with Sertoli cell number or testicular size begins with primitive spermatogonia in adult horses. J. Reprod. Fertil. 100:315-321.

  61. Johnson, L., C.E. Wilker, S.H. Safe, B.Scott, D.D. Dean, and P. White. 1994. 2,3,7,8-Tetrachlorodibenzo-p-dioxin reduces the number, size, and organelle content of Leydig cells in adult rat testes. Toxicology. 89:49-65.

  62. Johnson, L. 1994. A new approach to study the architectural arrangement of spermatogenic stages revealed little evidence of a wave along the length of human seminiferous tubules. J. Androl. 15:435-441.

  63. Wilker, C.E., T.H. Welsh Jr., S.H. Safe, T.R. Narasimhan, and L. Johnson. 1995. Human chorionic gonadotropin protects Leydig cell function against 2,3,7,8-tetrachlorodibenzo-p-dioxin in adult rats: role of Leydig cell cytoplasmic volume. Toxicology. 95:93-102.

  64. Clemmons, A.J., D.L. Thompson, Jr., and L. Johnson. 1995. Local initiation of spermatogenesis in the horse. Biol. Reprod. 52:1258-1267.

  65. Johnson, L., L.C. Suggs, Y.M. Norton, and W.C. Zeh. 1996. Effect of developmental age or time after transplantation on Sertoli cell number and testicular size in inbred Fischer rats. Biol. Reprod. 54:948-959.

  66. Johnson, L., L.C. Suggs, Y.M. Norton, T.H. Welsh Jr., and C.E. Wilker. 1996. Effect of hypophysectomy, sex of host, and/or number of transplanted testes on Sertoli cell number and testicular size of syngeneic testicular grafts in Fischer rats. Biol. Reprod. 54:960-969.

  67. Okwun, O.E., G. Igboeli, J.J. Ford, D.D. Lunstra, and L. Johnson. 1996. Sertoli cell number and function, spermatogonial number and yield, and daily sperm production in three breeds of boars. J. Reprod. Fertil. 107:137-149.

  68. Okwun, O.E., G. Igboeli, D.D. Lunstra, J.J. Ford, and L. Johnson. 1996. Testicular composition, number of A spermatogonia, germ cell ratios, and number of spermatids in three different breeds of boars. J. Androl.17:301-309.

  69. Johnson, L., K.S. McKenzie, and J.R. Snell. 1996. The partial wave in human seminiferous tubules appears to be a random occurrence. Tissue & Cell. 28:127-136.

  70. Durrant, B.S., J.E. Oosterhuis, L. Johnson, E.D. Plotka, P.G. Harms, and T.H. Welsh, Jr. 1996. Effect of testosterone treatment on the antler cycle of an Indian hog deer (cervus porcinus) with low endogenous testosterone. J. Zoo. and Wildlife Med. 27:76-82.

  71. Wilker, C.E., L. Johnson, and S. Safe. 1996. Effects of developmental exposure to indole-3-carbinol or 2, 3, 7, 8 - TCDD on reproductive potential of male rat offspring. Tox. and Appl. Pharm. 141:68-75.

  72. Gillespie, J.C., L.A. Jaeger, L. Johnson, and T.H. Welsh, 1996. Transforming growth factor alpha (TGFα) in testicular development of the prepubertal boar. Mol. Andro. 8:259-271.

  73. Nolan, C.J., J.L. Blackwell, J.T. French, F.C. Gardner, D.A. Knabe, R.D. Randel, L.A. Jaeger, L. Johnson, and T.H. Welsh, Jr., 1996. Use of neonatal porcine testis to study gonadotropin and growth factor control of steroidogenesis. Mol. Andro. 8:273-887.

  74. Blanchard, T.L. and L. Johnson. 1997. Determination of daily sperm production in stallions by enumeration of germ cells in homogenates. Theriogenology 47:655-664.

  75. Blanchard, T.L. and L. Johnson. 1997. Increased germ cell degeneration and reduced germ cell:Sertoli cell ratio in stallions with low sperm production. Theriogenology 47:665-678.

  76. Silber, S. And L. Johnson. 1998. Are spermatid injections of any clinical value? ROSNI and ROSI revisited. Human Reproduction 13:509-515.

  77. Johnson, L., J.J. Barnard, L. Rodriguez, E.C. Smith, R.S. Swerdloff, X.H. Wang, and C. Wang, 1998. Ethnic differences in spermatogenic potential in humans. J. Androl. 19:348-357.

  78. Huszar, G., P. Patrizio, and L. Johnson, 1998. Cytoplasmic extrusion and the switch from the creatine kinase B to M isoform are completed by the commencement of epididymal transport in human and stallion spermatozoa. J. Androl. 19:11-20.

  79. Sinha Hikim, A.P., C. Wang, Y. Lue, L. Johnson, X-H. Wang, and R.S. Swerdloff, 1998. Spontaneous germ cell apoptosis in humans: evidence of ethnic differences in the susceptibility of germ cells to programmed cell death. J. Clinical Endocrin. And Metab. 83:152-156.

  80. Cook, J.C., L. Johnson, J.C. O=Connor, L.B. Biegel, C.H. Krams, S.R. Frame, M.E. Hurtt. 1998. Effects of dietary 17β-estradiol exposure on serum hormone concentrations and testicular parameters in male Crl:CD7BR rats. Toxicol. Sciences 44:155-168.

  81. Wilker, C.E., N.H. Ing, T.H. Welsh, Jr., and L. Johnson, 1998. Syngeneic testicular grafts produce testosterone and express Sertoli cell genes characteristic of intact rats. J. Androl. (Submitted).

  82. Cerelli, J.S. and L. Johnson. 1998. No effect of gossypol on potential daily sperm production throughout spermatogenesis, Sertoli cell number, or seminiferous tubules in bulls. J. Androl. (Submitted).

  83. Adams, S.H., V. Esser, N.F. Brown, N.H. Ing, L. Johnson, D.W. Foster, and J.D. McGarry. 1998. Expression and possible role of muscle-type carnitine palmitoyl transferase I during sperm development in the rat. Biol. Reprod. 59:1399-1405.

  84. Varner, D.D., C.M. Scanlan, J.A. Thompson, G.W. Brumbaugh, T.L. Blanchard, C.M. Carlton, and L. Johnson. 1998. Bacteriology of preserved stallion semen and antibiotics in semen extenders. Theriogenology 50:559-573.

  85. Johnson, L., W.B. Neaves, J.J. Barnard, G.E. Keillor, S.W. Brown, and R. Yanagimachi. 1999. A comparative morphologic study of human germ cells in vitro and in situ within seminiferous tubules. Biol. Reprod. (Submitted).

Journal Review Publications (6): [back to top]

  1. Johnson, L. 1986. Spermatogenesis and aging in the human. J. Androl. 7:331-354.

  2. Johnson, L., C.E. Wilker, and J.S. Cerelli. 1994. Spermatogenesis in the bull. Proc. 15th Technical Conference on Artificial Insemination and Reproduction. National Association of Animal Breeders.

  3. Johnson, L. 1995. Local initiation and establishment of spermatogenesis in the horse. Proceeding XI Brazilian Congress on Animal Reproduction. 7-15.

  4. Johnson, L. 1995. Efficiency of spermatogenesis. Microscopy Res. and Tech. 32:385-422.

  5. Bartke, A., M. Cecium, L. Johnson, C.J. Meliska, and S. Milton. 1996. Direct and centrally-mediated effects of growth hormone on reproduction. Reprod. Dom. Anim. 31:397-402.

  6. Johnson, L., T.L. Blanchard, D.D. Varner, and W.L. Scrutchfield. 1997. Factors affecting spermatogenesis in the stallion. Therionology 48:1199-1216.

Book Chapters (4): [back to top]

  1. Johnson, L. 1989. Evaluation of the human testis and its age-related dysfunction. "Sperm Measures and Reproduction Success." Progress in Clinical and Biological Research. Vol. 302, Eds. E.J. Burger, Jr, R.G. Tardiff, A.R. Scialli, and H. Zenick, Alan R. Liss, Inc., New York, pp. 35-67.

  2. Johnson, L. 1989. Spermatogenesis (animal species and humans). Proceedings of the 1988 International Symposium on Gamete Physiology. Serono Symposia, Newport Beach, CA.

  3. Johnson, L. 1991. Spermatogenesis. In: Reproduction in Domestic Animals. (ed. P.T. Cupps), 4th ed., Academic Press, New York, pp. 179-219.

  4. Johnson, L., T.H. Welsh, Jr., and C.E. Wilker. 1997. Anatomy and physiology of the male reproductive system and potential targets of toxicants. In: Boekelheide and Chapin eds. Reproductive and Endocrine Toxicology - Male Reproductive Toxicology, Vol. 10 in Comprehensive Toxicology.

Book: [back to top]

Varner, D.D., J. Schumacher, T.T. Blanchard, and L. Johnson. 1991. Diseases and Management of the Breeding Stallion. American Veterinary Publications, Goleta, CA.

Symposium Publications (9): [back to top]

  1. Thompson, D.L., Jr., L. Johnson, and J.J. Wiest. 1987. Prolactin concentrations in stallion serum: effect of month and age. IV. Symposium on Equine Reproduction. J. Reprod. Fertil. (Suppl. 35).

  2. Johnson, L. and M.E. Tatum. 1988. Sequence of seasonal changes in numbers of Sertoli, Leydig, and germ cells in adult stallions. Proceeding of the 11th Internl. Congress on animal reproduction and artificial insemination. Dublin, Ireland, 3:373-374.

  3. Wilker, C.E., S.H. Safe, L. Johnson. 1995. Perinatal exposure to indole-3-carbinol alters male reporductive development similar to TCDD in Sprague-Dawley rats. Organohalogen Compounds. Toxicology 25:335-338.

  4. Johnson, L. 1995. Spermatogenesis in domestic animals and approaches to its enhancement at the Brazilian Congress of Animal Reproduction.

  5. Johnson, L. 1996. Spermatogenesis/factors affecting spermatozoan production. Second International Symposium on Stallion Semen in Amersfoot, The Netherlands.

  6. Johnson, L., G.U. Falk, L.C. Suggs, D.J. Henderson, G.E. Spoede, S.W. Brown, T.A. McGowen, H. Meguerditchian, and J.J. Barnard, 1997. Heterotopic transplantation as a model to study the regulation of spermatogenesis; some histomorphological considerations about sperm decline in man. 2Emes Journees De La Federation Francaise Pour L=Etude De La Reproduction at Clermont-Ferrand, France.

  7. Bartke, A., C. Melisa, S. Milton, L. Johnson, V. Chandrashekar, R.W. Steger and J.J. Kopchick. 1997. Effects of overexpression of different growth hormone genes on male reproductive functions in transgenic mice. Hormonal control of spermatogenesis basic and clinical aspects. Proc. Sat. Sympos. for VIth International Congress of Andrology. p1-15.

  8. Blanchard, T.L. and L. Johnson. 1997. Germ cell degeneration and reduced germ:Sertoli cell ratio explain low sperm production in stallions. Proceed. Amer. Assoc. Equine Practitioners, 43:1-3.

  9. Johnson, L. 1997. General reproductive physiology and capacity of the beef bull. Improving reproductive performance. Beef Improvement Federation. The National Association of Animal Breeders. Dickerson, North Dakota. p. 1-6.

Encyclopedia Publications (2): [back to top]

  1. Johnson, L., G.U. Falk, and G.E. Keillor, 1998. Male reproductive systems, other mammals. Encyclopedia of Reproduction (In press)

  2. Johnson, L., T.A. McGowen, and G.E. Keillor, 1998. Testis, overview (anatomy). Encyclopedia of Reproduction (In press)

Publication prepared for USAF School of Aerospace Medicine: [back to top]

Lebovitz, R.M., L. Johnson, and J. Orr. 1986. Testicular function and the effects of microwave radiation. Aerospace Medical Division (AFSC) Brooks Air Force Base, Texas 78235-5301.

 

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