26. Immobilized metal affinity chromatograpby (IMAC) is an important tool for recombinant protein purifications. Nickel (Ni2+) nitriloacetic acid (Ni-NTA) agarose is a commonly used affinity resin for IMAC. Which of the following peptide motif is often engineered to the target protein for IMAC-based purifications?
(A) Polyalanine
(B) Polyhistidine
(C) Polylysine
(D) Polyproline
(E) Polyglycine
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