'''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== *{{cite book|author=Frank J. Dye|title=Dictionary of Developmental Biology and Embryology|url=https://books.google.com/books?id=Z4ZHxrcFGkkC&pg=PA228|date=21 February 2012|publisher=John Wiley & Sons|isbn=978-0-470-90595-1|pages=228}}
{{DEFAULTSORT:Yolk Plug}} Category:Amphibians Category:Vertebrate developmental biology
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