Argentaffin and argyrophil cells in the appendix.
D000328:Adult; D000368:Aged; D001064:Appendicitis / Q000209:etiology; D001065:Appendix / Q000166:cytology*; D002838:Chromaffin System / Q000166:cytology*; D005260:Female; D006801:Humans; D006965:Hyperplasia / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009463:Neuroma / Q000473:pathology