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Complexes of α5β1 with Fabs that stabilize the closed headpiece. Representative class averages of SG/19 (A), mAb13 (B), and mAb13 + 9EG7 (C). Scales, rules, cross-correlations, and cartoons are described in the legend for Fig. 1, except the cross-correlated model or crystal structure included Fab SG/19 (A, classes 1–3) or a structure-based model of SG/19 Fab bound to the bent, compact ectodomain (A, classes 4 and 5).
