Assertion: heart valve's leaflet | /r/HasProperty | attached
Facets:
Source sentences:
text: The leaflets are attached to and supported by a ring of tough, fibrous tissue called the annulus.
text: The leaflets are attached to and supported by a ring of tough, fibrous tissue called the annulus.
text: The leaflets are attached to and supported by a ring of tough, fibrous tissue called the annulus.
text: The leaflets are attached to and supported by a ring of tough, fibrous tissue called the annulus.