Jisho

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Wikipedia definition
1. Yolk plugYolk plug is the remaining patch of endodermal cells that is created during the formation of the dorsal lip of the blastopore. It is a patch of large endodermal cells which remains exposed on the vegetal surface of the amphibian blastula that will eventually be internalized by epiboly.
Read “Yolk plug” on English Wikipedia
Read “卵黄栓” on Japanese Wikipedia
Read “Yolk plug” on DBpedia

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