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Active-site overlay of psCA3 in space groups I222 (cyan) and P21212 (light green). Modeled water molecules for the I222 structure are shown in red and those for the P21212 structure are shown in blue. Note that the Asp44–Arg46 salt-bridge dyad is in the open active-site conformation in both structures. Active-site residues are labeled; the r.m.s.d. between Cα atoms for the two structures is 0.16 Å
