| http://www.w3.org/ns/prov#value | - The linker may be comprised of atoms capable of forming at least two covalent bonds, such as carbon, silicon, oxygen, sulfur, phosphorous, and the like, or may be comprised of molecules capable of forming at least two covalent bonds, such as sugar-phosphate groups, amino acids, peptides, nucleosides, nucleotides, sugars, carbohydrates, aromatic rings, hydrocarbon rings, linear and branched hydroca
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