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 ...

This discovery provides new insights into pollen grain development and seed formation, paving the way for innovative ...

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 ...

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.

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 ...