Ultrastructure of the normal atrial endocardium.
D000293:Adolescent; D000328:Adult; D004699:Endocardium / Q000033:anatomy & histology* / Q000166:cytology*; D006325:Heart Atria / Q000033:anatomy & histology; D006801:Humans; D008853:Microscopy; D008854:Microscopy, Electron; D008875:Middle Aged