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Clefts and cavities in the structure of YlxR protein were calculated using the program SURFNET (Laskowski, 1995) and displayed with RasMol (Sayle & Milner-White, 1995). Only the four largest cavities are shown (red, 2885 Å3; magenta, 497 Å3; yellow, 455 Å3; blue, 348 Å3). The major cavity (red) includes two sulfate ions (sul1 and sul2).
