| http://www.w3.org/ns/prov#value | - such polypeptide being in the above form or modified by isosteric replacement of one or more remaining peptide bonds by reduced, --CH2 --NH--, keto, ##STR10## hydroxy, --CH(OH)--CH2 --, or hydrocarbon, --CH-2 --CH2 --isosteric links and further being in free form or in protected or salt form at one or more remaining peptide, carboxyl, amino, hydroxy or other reactive groups, in particular as their
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