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Ribbon structure of λ6–85 based on the PDB structure 1LMB. D14, Q33, A46, and A48 (rate-accelerating) residues are shown in red, G37 and G49 (rate-decelerating) in blue, and A45 and A79 (rate-accelerating only at high temperature) in yellow. The chromophore W22 is shown in pink. See also Hecht et al. (1984) for early mutant studies.
