56, No. 3, Sep., 1913 The Origin and Development of the Embryo... The Origin and Development of the Embryo Sac and Embryo of Dendrophthora opuntioides and D. gracile. II This is the metadata section.

3. The mature embryo sac contains an egg, two synergids, three antipodal cells which multiply to several, and two polar nuclei which fuse. 4. During the formation of the embryo sac a lobe develops ...

The role of the yolk sac in early gestation is to supply the embryo with oxygen and nutrients until the formation of the placenta is accomplished. The yolk sac is also the first site of ...

A scientific advance aimed at generating organs for transplantation—biotech innovation from one of the world’s leading ...

As division continues, some cells divide into the growing mass, distinguishing cells that form the embryo (epiblast) from those that form the placenta (trophectoderm). Further cell divisions lead to ...

To understand this process better, Zernicka-Goetz set out to investigate if human embryonic development resembled that of mice ... and the hypoblast, or the yolk sac. When they tracked GFP expression, ...

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 ...