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Male infertility due to absence of spermatogonial stem cells.[140] In the latest reports, scientists have discovered a method to unravel this issue by reprogramming a cell and turning it into a spermatozoon.아래에 가라 앉은 액체층과 맨 위 기름층은 처음에 부어보이게만 만들뿐, 지방이 "생착"하는데 방해만 하기