when day-3 mouse embryos were cultured in a simple medium supplemented with uterine fluids of mice autopsied on day 4 of pregnancy , 48 h after administration of oestradiol , or during pro-oestrus , the percentage of blastocysts hatching from the zona pellucida was significantly greater than in unsupplemented medium .
C0032961
pregnancy
C0014912
oestradiol