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URL：https://lh3.googleusercontent.com/-5MTmcECxceE/WfXWUT5rQ9I/AAAAAAAByrM/c1PMV3AR5lEO5Qyv0F-Glk_8CHAd9lligCCoYBhgL/s2048/Spermatogenesis-and-a-seminiferous-tubule2.jpg 掲載元：https://www.anatomy.tokyo/systematic/精子形成と精細管の断面図/
