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One of the most popular enzymes used for the in vitro cleavage of fusion proteins is enterokinase (EK, E.C. 3.4.21.9). EK cleaves with high specificity after the sequence Asp4-Lys (DDDDK), which allows the fusion protein to preserve its native amino acid terminus without any additional unwanted cleavage residue from the recognition sequence. However, the complete removal of EK after protein cleavage...
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