Biology:Yolk plug
From HandWiki
Yolk plug is the remaining patch of endodermal cells that is created during the formation of the dorsal lip of the blastopore in the amphibian. It is a patch of large endodermal cells which remains exposed on the vegetal surface of the blastula that will eventually be internalized by epiboly.
References
- Frank J. Dye (21 February 2012). Dictionary of Developmental Biology and Embryology. John Wiley & Sons. pp. 228. ISBN 978-0-470-90595-1. https://books.google.com/books?id=Z4ZHxrcFGkkC&pg=PA228.
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