title: The origin of snakes and evolution of the venom apparatus.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005088:Exocrine Glands / Q000033:anatomy & histology; D012909:Snake Bites; D012910:Snake Venoms / Q000378:metabolism; D012911:Snakes / Q000033:anatomy & histology / Q000145:classification / Q000502:physiology*
chemical_list: D012910:Snake Venoms