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Dictionary

pro•to•stome

Pronunciation: (prō'tu-stōm"), [key]
—n. Zool.
any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm. Cf. deuterostome.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

protostele

prototherian

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