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Prediction of a heptad repeat in the TM helix (residues 267–285) of HO-1. Using the COILS and Paircoil2 methods, a heptad repeat (a-g positions) in the TM helix was predicted, as shown in the sequence (A) or on a helical wheel (B). The amino acids at the “a” and “d” positions are hydrophobic, as in a typical coiled coil. C, proposed interface between two HO-1 TM α-helices.
