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Definition of Term

(english) Opening formed by and bordered by the germ ring as it extends over the yolk, also a circular area on the yolk of Teleostei eggs not covered by the advancing germ ring during epiboly. (See also: yolk-sac, egg development, LarvalBase)
(french) Ouverture formée et bordé par l'anneau germinal lors de son extension sur le vitellus (See also: yolk-sac, egg development, LarvalBase)

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