| http://www.w3.org/ns/prov#value | - FIG. 5 illustrates still another embodiment of a protrusion 24?????? with a free end unattached to an anchoring ring 18.?????? In addition or alternatively, as shown in FIG. 6, a protrusion 24?????? may be provided that is solid, and may be filled with a material, such as the radiopaque or other materials described above and/or an agent delivery matrix, therapeutic agent, and/or diagnostic agent,
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