引言我们生命的起点，始于精子与卵子结合形成受精卵（zygote），随后在短短几天内经历一系列精密调控的分裂与分化，最终发展成具有多种细胞类型的囊胚（blastocyst），为胚胎成功植入子宫做好准备。然而，即便在最理想的生殖条件下，仍有大量受精卵无法 ...

At 5 DPO, if the sperm has reached and fertilized the egg, the cells within the newly formed zygote multiply to create a lump of cells called a blastocyst. These cells multiply as the blastocyst ...

That might seem surprising upon finding out that, when armadillos get jiggy with it, only one egg is fertilized. But, like ...

The invisible cow is one that you see three times a year: at calving, breeding, and then again at dry off. This is a cow that ...

Preterm birth (PTB) continues to pose a challenge in neonatal medicine, and it is the major cause of perinatal morbidity and ...

Chinese scientists have successfully created the first healthy mouse with two biological fathers, a breakthrough in genetic research.

Holligan’s embryo is far from the only one in this peculiar limbo. Millions—or potentially tens of millions—of embryos created through IVF sit frozen in time, stored in cryopreservation tanks around ...

Look closely at this image, stripped of its caption, and join the moderated conversation about what you and other students see. By The Learning Network Look closely at this image, stripped of ...

PPAR-γ–deficient ES cells were derived from the inner cell mass (ICM) of blastocysts collected from PPAR-γ–heterozygous matings 13. PPAR-γ–heterozygous females were super-ovulated with ...

Ectopic pregnancy occurs in the fallopian tube in over 95% of cases. [3] Other locations for ectopic pregnancies are rare: abdominal, ovarian or cervical. The most common location in the fallopian ...