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The crystal structure of the segment 1529–1681 of CyaA [15]. The consecutive nonapeptide tandem repeats (G-G-X-G-X-D-X-X-X) are arranged in a regular right-handed helix of parallel β-strands (β-roll). β-strands and the C-terminal α-helix are colored in blue and green, respectively. Calcium ions are represented by yellow balls.
