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(a) Rasmol image of the dimeric λ repressor/operator complex [PDB code 1lmb (3)] with the HTH motif in each protein subunit highlighted in black. The protein is depicted with the secondary structures as cartoons and the double-stranded DNA molecule is shown in stick representation. (b) Detail of Rasmol image of the HTH motif extracted from chain 3 of the λ repressor/operator complex which spans residues 33–51.
