Extraembryonic mesoderm migrates through primitivestreak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
2
The hematopoietic and vascular systems of the mouse arise from extraembryonic mesoderm that migrate through primitivestreak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.