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mesomere

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mesomere

[′me·zō‚mir]
(embryology)
The muscle-plate region between the epimere and hypomere in vertebrates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
For example, contrary to expectations, 16% (8/51) of labeled an2 mesomeres in Lytechinus variegatus formed both ectoderm and endoderm (Logan and McClay, 1997).
A shift in germ layer allocation is correlated with large egg size and facultative planktotrophy in the echinoid Clypeaster rosaceus
In embryos of many sea urchin species, A-V polarity is evidenced by the unequal sizes of blastomeres of the 16-cell embryo, which consists of tiers of eight mesomeres, four macromeres, and four micromeres.
Interactions of different vegetal cells with mesomeres during early stages of sea urchin development.
Fate specification along the sea urchin embryo animal-vegetal axis
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