| http://www.w3.org/ns/prov#value | - The polypeptide of interest can be, for example, a peptide tag such as a polyhistidine sequence, a c-myc epitope, a FLAG epitope, and the like; can be an enzyme, which can be used to effect a function in a cell expressing a fusion protein comprising the enzyme or to identify a cell containing the fusion protein; can be a protein to be examined for an ability to interact with one or more other prot
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