The mid-developmental transition and the evolution of animal body plans

2016 
Embryos in a particular phylum of the animal kingdom tend to most resemble one another at a stage in the middle of embryogenesis known as the phylotypic period; a transcriptional analysis of embryogenesis from single embryos of ten different phyla reveals that the transcripts expressed at the phylotypic stage (or mid-developmental transition) differ greatly between phyla, and a ‘phylum’ may be defined as a set of species sharing the same signals and transcription factor networks during the mid-developmental transition.
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