Incidence of ancestral characters in the morphogenesis of specialized structures.
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D000818:Animals; D001717:Birds / Q000196:embryology*; D002490:Central Nervous System / Q000196:embryology*; D005121:Extremities / Q000196:embryology*; D008116:Lizards / Q000196:embryology*; D009296:Nasal Cavity / Q000196:embryology*; D009833:Olfactory Pathways / Q000196:embryology*; D010802:Phylogeny