http://www.w3.org/ns/prov#value | - kyl chain optionally containing 1 or more e.g. 2 N, S, O or P chain atoms, especially methyl, which can be functionalised, any amino acid side chain, such as alanine, phenylalanine, valine and glutamic acid, a 4 to 7 membered heterocyclic ring optionally containing 1 or 2 N, S, O or P atoms or a 5 or 6 membered aromatic ring, optionally containing 1 or 2 N, O or S atoms which may be fused to anoth
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