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