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Factor X
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==Use in biochemistry== The factor Xa protease can be used in biochemistry to cleave off [[protein tag]]s that improve expression or purification of a protein of interest. Its preferred cleavage site (after the arginine in the sequence Ile-Glu/Asp-Gly-Arg, IEGR or IDGR) can easily be engineered between a tag sequence and the protein of interest. After expression and purification, the tag is then proteolytically removed by factor Xa.
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