Ontogeny and phylogeny of the yolk exten
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Valerie Christine Virta; Mark Scott Cooper
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Article
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2009
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John Wiley and Sons
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English
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## Abstract The validity of defining a common phylotypic stage for all vertebrates has been questioned because of variations in embryonic morphological traits between vertebrate classes, as well as variations in embryonic phenotypes between species of the same vertebrate class. To evaluate the evol