title: Ultrastructural studies on the secretory activity of the oviduct epithelium of the platypus.
mesh_terms: D000818:Animals; D004847:Epithelial Cells; D004848:Epithelium / Q000378:metabolism; D005187:Fallopian Tubes / Q000166:cytology / Q000378:metabolism*; D005260:Female; D008322:Mammals / Q000033:anatomy & histology*