A germ layer is a collection of cells, formed during animal embryogenesis. Germ layers are only really pronounced in the vertebrates. However, all animals more complex than sponges (eumetazoans and ...

One of the biggest quests in biology is understanding how every cell in an animal's body carries an identical genome yet ...

How did the gut, the skin and musculature evolve? This question concerns scientists for more than a century. Through the investigation of the embryonic development of sea anemones, a very old animal ...

Proceedings of the Royal Society of London. Series B, Biological Sciences, Vol. 134, No. 876 (Jul. 2, 1947), pp. 377-398 (30 pages) A critical study and demonstration of the distribution of yolk ...

Researchers have discovered that microRNAs play an important role in embryonic development. The study pinpoints two microRNA families that direct the allocation of cells into the three germ layers -- ...

The discovery of a new kind of stem cell challenges conventional thinking about embryonic development. According to the traditional view, the human embryo develops from a three-layered collection of ...

In their publication in Science, Professor Guojun Sheng (Kumamoto University, Japan), Professor Alfonso Martinez Arias (Universidad Pompeu Fabra, Spain) and Professor Ann Sutherland (University of ...

How does the “body” take shape? The body of animals is highly complex, containing distinct regions that carry out specific functions. As the body forms during embryogenesis, three germ layers are ...

PERHAPS the reviewer should have made it plainer that the difficulty he stated at the top of p. 303 is not admitted by those morphologists who have ceased to believe that the germ layers afford any ...