Catecholamines.
D001003:Anal Canal / Q000032:analysis*; D001681:Biological Assay; D002395:Catecholamines / Q000032:analysis*; D003106:Colon / Q000032:analysis*; D006651:Histocytochemistry; D006801:Humans; D066298:In Vitro Techniques; D008856:Microscopy, Fluorescence
D002395:Catecholamines