The Artstor website will be retired on Aug 1st. Botanical Gazette Vol. 84, No. 3, Nov., 1927 Development of Ovule and Embryo Sac of C... 1. The axis of the flower must have developed long before the ...

A stem-cell derived human embryo model showing blue cells (embryo), yellow cells (yolk sac) and pink cells (placenta). Scientists have grown an entity that closely resembles an early human embryo ...

Created from stem cells, without eggs, sperm, or a womb, the embryo model had a yolk sac and a proto-placenta, resembling a state that real human embryos reach after approximately 14 days of ...

An Alabama couple filed a new lawsuit against a major women’s health company, saying its failure to inspect one of its ...

a: Lateral view of a 4-week embryo showing the relationship of primordial gut to yolk sac. b: Drawing of median section of the embryo showing the early digestive system and its blood supply.

Watch an ink injection into the yolk sac artery of a 72 hour-old chick embryo to reveal its beating heart vasculature. This was shot by Anna Franz using a reflected light microscopy technique in ...

Conjoined fetuses are a rare type of identical twins that share a placenta and an amniotic sac, when the embryo divides at 13-15 days from conception. The incidence ranges from 1/50,000-1/100,000 ...

The embryo forms a hollow sphere called a blastocyst, with some cells destined to go on to form the placenta, some the yolk sac and others, ultimately, us. But without OCT4 the blastocyst cannot form.

The PHS Policy covers all live vertebrate animals. If an embryo hasn't hatched yet, or an early-larval-stage fish hasn't used up its yolk sac yet, is it not still a vertebrate animal? My facility ...