منابع مشابه
Evo-devo of feathers and scales: building complex epithelial appendages.
Abbreviations BMP bone morphogenetic protein FGF fibroblast growth factor mya million years ago NCAM neural cell adhesion molecule PKA protein kinase A PKC protein kinase C RCAS replication-competent avian sarcoma virus SHH Sonic hedgehog TGF-β β transforming growth factor-β
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The taxon name “Aves” is currently used for several different clades, a situation that violates the fundamental nomenclatural principle that, to minimize ambiguity, each taxon name should refer to a single taxon. To clarify this situation, we explore some general issues concerning the properties of the three classes of phylogenetic definitions, including: how names can be tied to clades through...
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How have anoles evolved such diverse morphologies? This is an exciting time in anole biology because recently the genome of the green anole, Anolis carolinensis, was completely sequenced (http://www.broad.mit. edu/models/anole/). The completion of an anole genome opened a new avenue of research into the genetic changes that accompany adaptive radiation. Researchers would like to know how many, ...
متن کاملMany variations on a few themes: a broader look at development of iridescent scales (and feathers).
Iridescent structures are some of the most visually stunning phenomena in biological organisms. Insects and birds have in common the display of such colours in their non-living investiture, the scales and bristles in insects and the feathers in birds. The biological mechanisms underlying the formation of these structures, at least in insects, appear quite conservative in that the same architect...
متن کاملFormation of feathers on chick foot scales: a stage-dependent morphogenetic response to retinoic acid.
In the chick embryo, large scales (scuta) form on days 9-11 on the anterior face of the shank and the upper surface of the toes; smaller scales (scutella) appear on day 11 on the posterior face of the shank; most of the smallest scales (reticula) form on days 12 and 13 on the plantar surface of the foot. A single injection of 125 micrograms of retinoic acid (RA) into the amniotic cavity caused ...
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ژورنال
عنوان ژورنال: Nature
سال: 2006
ISSN: 0028-0836,1476-4687
DOI: 10.1038/440287a