He established the San Diego Zoo’s cryopreserved Frozen Zoo.

Complications during pregnancy may act via the placenta to magnify the effects of genetic risk factors.

A small, placenta-produced peptide fixes the pregnancy-related condition in mice. 

Placentas from mice with genetically distinct immune systems, stained to highlight differences in three proteins, representing the nucleus (blue), blood vessels (red), and trophoblasts (green)

The lungs of extremely premature lambs supported in a closed, sterile environment that enables fluid-based gas exchange grow and develop normally, researchers report.

An endogenous retrovirus that supports placenta formation in females also helps male mice build muscle, according to a study.

Placental macrophages called Hofbauer cells are particularly vulnerable to infection by the virus, a study shows.

Certain immune cells surrounding the organ appear to block viral entry.

Biologist Christopher Coe answers readers’ questions about the prescient organ.