| http://www.w3.org/ns/prov#value | - (a) culturing prokaryotic host cells that have DNA encoding a ubiquitin hydrolase integrated into their chromosomes and are transformed with an expression vector comprising a nucleotide sequence encoding a ubiquitin-polypeptide conjugate wherein the polypeptide is conjugated to the C-terminus of the ubiquitin and wherein the polypeptide contains any amino acid except proline at its N-terminus such
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