Your Artstor image groups were copied to Workspace. 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 ...

There is a yolk sac, which has some of the roles of the liver and kidneys, and a bilaminar embryonic disc - one of the key hallmarks of this stage of embryo development. The hope is embryo models ...

In normal embryonic development, cells repeatedly sort and ... an extra-embryonic cell layer that produces the nutrient-providing yolk sac and the embryonic layer that will give rise to the ...

the embryo model had a yolk sac and a proto-placenta, resembling a state that real human embryos reach after approximately 14 days of development. It even secreted hormones that turned a drugstore ...

respiratory and excretory exchange of material by diffusion between embryonic and maternal circulatory systems. The marsupials have a yolk sac placenta (the initial stage in the development of the ...