title: Independent origin of the trichoptile and neoptile in bird plumage.
authors.affiliation: Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr 33, Moscow, 117071 Russia.
authors.forename: V Yu
authors.initials: VY
authors.lastname: Ilyashenko
mesh_terms: D000818:Animals; D005075:Biological Evolution; D001717:Birds / Q000033:anatomy & histology* / Q000145:classification / Q000196:embryology; D005241:Feathers / Q000033:anatomy & histology* / Q000196:embryology; D008855:Microscopy, Electron, Scanning