| http://www.w3.org/ns/prov#value | - s, with the hetero atom being nitrogen, oxygen, sulfur, phosphorus, boron, or the like, with examples of suitable substituents including but not limited to mercapto groups, hydroxy groups, amine groups, imine groups, ammonium groups, pyridine groups, pyridinium groups, ether groups, aldehyde groups, ketone groups, ester groups, amide groups, carboxylic acid groups, carbonyl groups, thiocarbonyl gr
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