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Structural alignment of PSAT from B. alcalophilus (BALC), B. circulans (BCIR), and E. coli (ECOLI). Identical residues are shown in red boxes. The residues are numbered as in the BALC PSAT model. Secondary structure elements for BALC, BCIR, and ECOLI PSAT are presented in blue, red, and green, respectively; helices (α), strands (β), and 310 helices (η) are labeled for BALC PSAT. Active site residues are labeled with triangles. The figure was produced using ESPript (Gouet et al. 1999).
