?:definition
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Isoenergetic transfer of ISG15 from one protein to another via the reaction X-ISG15 + Y -> Y-ISG15 + X, where both the X-ISG15 and Y-ISG15 linkages are thioester bonds between the C-terminal amino acid of ISG15 and a sulfhydryl side group of a cysteine residue. [GOC:dph]
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