title: Development mechanisms underlying the formation of atavisms.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005121:Extremities / Q000033:anatomy & histology; D005823:Genetics; D006801:Humans; D009132:Muscles / Q000033:anatomy & histology; D009154:Mutation; D014714:Vertebrates / Q000033:anatomy & histology*