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Recombinant human XCL2 protein is expressed in E. coli, refolded and purified as the native form of the mature chemokine that is secreted from cells after cleavage of the signal peptide to yielding a 93 residue polypeptide. Human XCL2 only differs from its paralog XCL1 by two amino acid residues near the N terminus. Like XCL1, XCL2 is a unique metamorphic chemokine that interconverts between two distinct conformations under physiological conditions.
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