Assertion: melatonin | /r/CapableOf | prevent the formation of ulcers
Facets:
value: on gi mucosa
type: LOCATION
value: through its antioxidant action
type: MANNER
Source sentences:
text: Melatonin also prevents the formation of ulcers on GI mucosa through its antioxidant action, and can reduce the secretion of excessive hydrochloric acid.