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(a) Ribbon representation of the superimposed SsuAs from E. coli (blue) and X. axonopodis pv. citri (magenta). The HEPES molecule is shown as black sticks. The loops from domain I have been truncated for visualization. (b) Close-up view of the superimposed domains II. The rotation axis is shown as a solid black line. (c) Superimposition of the two domains from (b) along the rotation axis. They superimpose with an r.m.s.d. of 0.96 Å.
