title: Light and electron microscopic studies on the endocrine cells in the duck proventriculus.
mesh_terms: D000818:Animals; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D004372:Ducks / Q000033:anatomy & histology*; D004702:Endocrine Glands / Q000166:cytology* / Q000648:ultrastructure; D005260:Female; D008297:Male; D008854:Microscopy, Electron; D011531:Proventriculus / Q000166:cytology* / Q000648:ultrastructure