Figure 9. Comparison of cytochrome c1 and hinge protein from the orthorhombic crystals of chicken bc1 (1bcc) with that from the p6522 bovine enzyme (1be3). The bovine structure is on the left, the chicken on the right. A significant difference (described in the text) is indicated by the gray arrow. Because this area has poor order in both structures, the difference could be due to mis-tracing the polypeptide chain as well as to crystal packing or species differences.