Assertion: heart valve | /r/MadeOf | porcine
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Tissue heart valves are usually made from animal tissues, either animal heart valve tissue or animal pericardial tissue, and commonly porcine.
text: Tissue heart valves are usually made from animal tissues, either animal heart valve tissue or animal pericardial tissue, and commonly porcine.