Source:http://linkedlifedata.com/resource/umls/id/C0504215
UWDA: Anatomical structure, which consists of one or more types of tissues, spatially related to one another in patterns determined by coordinated gene expression; together with other contiguous organ parts, it constitutes an organ. Examples:endothelium, osteon, cortical bone, neck of femur, bronchopulmonary segment, left lobe of liver, anterior interventricular branch of leftcoronary artery, right atrium, mitral valve.