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Keywords:

  • emu;
  • ratite;
  • dromaius;
  • avian evolution;
  • embryonic development;
  • gastrulation;
  • mesoderm;
  • heterochrony;
  • somite;
  • limb

Abstract

A stage HH38 emu embryo with extraembryonic tissues removed. The size of its vestigial wings is comparable to that of the middle toe at this stage. From Nagai et al., Developmental Dynamics 240:162–175, 2011.