Such multi-purpose stem cells have previously been found in mice testes by Takashi Shinohara of Kyoto University, Japan, but only in animals up to two days old2.

• 以前，日本京都大学的篠原贵司已在老鼠睾丸中发现了这类多用途干细胞，不过只是在两天大的老鼠体内发现的。