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Top and side views of CA26, showing schematically the folding of the macrocycle into two left-handed single helices connected in the form of a “figure eight.” O(2) and O(3) oxygen atoms are drawn red and the other atoms are symbolized by a gray tube passing through O(4) atoms; all other atoms are omitted. Band-flips occur at the two positions in the macrocycle indicated by yellow arrows. Overall size of CA26: 27 Å × 15 Å × 21 Å (height). Drawn with insight ii (32).
