| http://www.w3.org/ns/prov#value | - The prosthesis 920 also includes other spikes 942 that protrude generally radially from a base portion 944 of the prosthesis, such as described herein, for engaging and/or penetrating surrounding tissue at the annulus 924. [0133] As mentioned above, the buttress 938 extends axially from an arc of the base portion 944 radially inwardly for a first part of its length and then curves radially outward
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