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This result is consistent with that reported in literature so far. The relative abundance of overall "cysteinylated" species resulted in the range between 46% and 36%, which has also been confirmed using orthogonal techniques such as Ellman's assay. Our data clearly demonstrate that the free cysteine (Cys252) on the p40 subunit of recombinant IL-12 is also present in its cysteinylated and homocysteinylated forms at a considerable rate. Our observations, although based on results obtained on an IL-12-derived fusion protein, are consistent