Folding results. Stereo diagrams showing the Ca backbone (blue, 1-3 and 6-8; red, 11-21) and selected side chains (Tyr 1, Val/Tyr 3, Tyr 6, Phe/Trp 8, Glu 13, Leu 14, Leu 17 and Leu 18) for folding trajectories terminating with low r.m.s.d.Ca to BBA5. a, NMR structure of BBA5. b, Double mutant at 2.2 A . c, Double mutant at 2.4 A. d, Single mutant at 2.5 A .

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