title: The fine structure of ultimobranchial secretory cells in the anurans: Rana temporaria L. and Bufo bufo L.
mesh_terms: D000818:Animals; D001001:Anura; D002023:Bufo bufo / Q000033:anatomy & histology*; D004702:Endocrine Glands / Q000166:cytology*; D005260:Female; D008297:Male; D008854:Microscopy, Electron; D011896:Rana temporaria / Q000033:anatomy & histology*; D013045:Species Specificity