Mononuclear cells (including stem cells/progenitor cells) derived from male mouse hone marrow were injected into fetal mouse peritoneal cavity during the pro-immune period.

• 将雄鼠骨髓单核细胞宫内注射到胎鼠腹腔，在受体鼠出生后检测雌性受体鼠外周血细胞。