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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. p. 228. ISBN 978-0-470-90595-1.

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