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. 2007 Oct 9;104(42):16410–16415. doi: 10.1073/pnas.0705759104

Fig. 5.

Fig. 5.

Robustness of an AH as a function of parallel HBs per turn, b, predicted by the hierarchical Bell model. Robustness is defined as the ratio of strength of a failed system and an intact system. In the intact system, all HBs contribute to strength, whereas in the failed system, all except one HB contribute to the strength. The shaded bar indicates the number of parallel HBs per turn (3.6 HBs) as observed in nature. This particular molecular geometry corresponds to a robustness value of ≈80%, indicating that the AH is efficient in Pareto's sense (38, 39).