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原文連結
論文資訊
- 類型：已發表論文
- 日期：2009
摘要
Whole-基因組 sequences from the choanoflagellate Monosiga brevicollis, the placozoan Trichoplax adhaerens and the cnidarian Nematostella vectensis have confirmed results from comparative 演化ary developmental studies that much of the developmental toolkit once thought to be characteristic of bilaterians appeared much earlier in the 演化 of animals. The 多樣性 of transcription factors and signalling pathway genes in animals with a limited number of cell types and a restricted developmental repertoire is puzzling, particularly in light of claims that such highly conserved elements among bilaterians provide evidence of a morphologically complex protostome-deuterostome ancestor. Here, I explore the early origination of elements of what became the bilaterian toolkit, and suggest that placozoans and cnida
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