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Size exclusion chromatography of the XylS C-terminal domain. The elution profile of XylS-CTD is shown (continuous line). The following molecular mass standards were used: bovine serum albumin (66 kDa), ovalbumin (45 kDa), carbonic anhydrase (29 kDa), trypsin inhibitor (20 kDa), and cytochrome c (12.4 kDa). R2 = 0.9979. mAU, milli-absorbance units. (Insert) SDS-PAGE of 10 μl of the four 0.5-ml fractions forming the protein peak (numbered as 1, 2, 3, and 4 in the elution profile).
