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  • Comparative bat ontogeny
  • Bat embryos
  • Abzhanov, A., Protas, M., B. Grant, R., Grant, P.R. and Tabin, C.J. (2004). Bmp4 and Morphological Variation of Beaks in Darwin's Finches. Science, 305, 1462-1465.
  • Alligator embryo, SEM
  • Two alligator embryos
  • Alligator embryo
  • Alligator embryo
  • Alligator and Chicken embryos
  • Alligator embryo skeleton
  • Alligator embryo expressing HOXB4
  • Alligator embryo expressing HOXC8, side view
  • Alligator embryo expressing HOXC8, top view
  • Alligator embryo skeleton
  • Bhullar, B, Marugán-Lobón J, Racimo F, Bever GS, Norell MA, Rowe TB, Abzhanov A. 2012. Birds have paedomorphic dinosaur skulls. Nature. 487:223–226.