| http://www.w3.org/ns/prov#value | - For example, a flexible, resiliently yieldable material such as silicon, plastic, polytetrafluoroethylene (PTFE), expanded-PTFE (ePTFE), polyurethane, or other similar material could be chosen if the sewing ring 444 is to be stitched to the annulus 314 with sutures 646.
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