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Structure of C2B-B. (A) Front and side view of ribbon diagrams of the structure of C2B-B with 2 Ca2+ ions. β-Strands are labeled from 1 to 8, while helices are labeled H1 and H2. Ca2+ ions are labeled Ca1 and Ca2. (B) Front and back view of electrostatic potential surface of C2B-B. The acidic and basic residues are colored green and orange, respectively.
