title: Heads or Tails? Karl Ernst von Baer, Robert Remak, and characterization of the primary axis in animal eggs.
authors: Athula H
authors: AH
authors: Wikramanayake
mesh_terms: D000818:Animals; D019521:Body Patterning / Q000502:physiology*; D016764:Cell Polarity / Q000502:physiology*; D015509:Developmental Biology / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D015053:Zygote / Q000166:cytology*