その前の文章から続けて読めばわかるけど、これはSTAP細胞由来マウスの
ジャームライントランスミッション確認実験だ。
>>
Because the number of CD45+ cells from a neonatal spleen was small, we mixed spleen cells from male and female mice for STAP cell conversion. To make germline transmission more efficient, we intercrossed chimaeras in some experiments.
