Polarities in Mammalian Evolution Seen Through Homologs of the Inner Cell Mass

@article{Lillegraven2004PolaritiesIM,
  title={Polarities in Mammalian Evolution Seen Through Homologs of the Inner Cell Mass},
  author={Jason A. Lillegraven},
  journal={Journal of Mammalian Evolution},
  year={2004},
  volume={10},
  pages={277-333}
}
Embryogenetic pathways differ markedly among monotremes, marsupials, and placentals, and their analysis provides information of fundamental importance to recognition of mammalian evolutionary directions. The cap of cuboidal cells of the marsupial late unilaminar blastocyst, generally known as the “embryonic area,” probably is induced to form (prior to origin of Hensen's node) by signals from earliest hypoblastic cells (“anterior visceral endoderm”). The thickened cap is a “medullary plate” of… CONTINUE READING

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