An ultrastructural and immunocytochemical study on endocrine cells in the proximal duodenum of the echidna (Tachyglossus aculeatus).
D000818:Animals; D004386:Duodenum / Q000378:metabolism / Q000648:ultrastructure*; D006651:Histocytochemistry; D007124:Immunoenzyme Techniques; D008854:Microscopy, Electron; D009007:Monotremata / Q000033:anatomy & histology*; D004442:Tachyglossidae / Q000033:anatomy & histology*