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 ...

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 ...

Created from stem cells, without eggs, sperm, or a womb, the embryo model had a yolk sac and a proto-placenta, resembling a ...

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 ...

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.