| http://www.w3.org/ns/prov#value | - For some purposes, it is preferable to produce the polypeptide in a recombinant system in which the protein contains an additional sequence tag that facilitates purification, such as, but not limited to, a polyhistidine sequence or a sequence that specifically binds to an antibody, such as FLAG??? and GST. The polypeptide can then be purified from a crude lysate of the host cell by chromatography
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