part_of part of phenotype affects entity Abnormal duodenum morphology Duodenal ulcer SNOMEDCT_US:51868009 UMLS:C0013295 MEDDRA:10013836 HP:0002588 An erosion of the mucous membrane in a portion of the duodenum. SNOMEDCT_US:367474008 Gastrointestinal ulcer ulcer duodenal ulcer duodenum duodenal ulcer