| http://www.w3.org/ns/prov#value | - Linkers typically comprise a direct bond or an atom such as oxygen or sulfur, a unit such as NH, C(O), C(O)NH, SO, SO 2 , SO 2 NH or a chain of atoms, such as substituted or unsubstituted Ci-C 6 alkyl, substituted or unsubstituted C 2 -C 6 alkenyl, substituted or unsubstituted C 2 -C 6 alkynyl, substituted or unsubstituted C 6 -Ci 2 aryl, substituted or unsubstituted Cs-Q 2 heteroaryl, substituted
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