stomach pylorus smooth muscle contraction pyloric antrum smooth muscle contraction https://github.com/geneontology/go-ontology/issues/13607 antrum smooth muscle contraction biological_process GO:0120065 A process in which force is generated within gastric smooth muscle tissue, resulting in a change in muscle geometry. This process occurs in the widest part of the pylorus that is continuous with the body of the stomach. krc 2017-06-13T22:36:20Z