title: [Initial stage in the evolution of the mesothelium].
mesh_terms: D000818:Animals; D000845:Annelida / Q000033:anatomy & histology / Q000196:embryology*; D005075:Biological Evolution; D006376:Helminths / Q000033:anatomy & histology / Q000196:embryology*
vernacular_title: O nachal'nom étape évoliutsii mezoteliia.