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The model was constructed by combining one of three crystal structures of lambda cro bound to operator (pdb ID 4cro - Brennan, et al., 1990) and a lamda cro dimer crystal structure (pdb ID 5cro - Ohlendorf, et al., 1998) using Hyperchem molecular modeling software. Two chains of one cro dimer were extracted from 5cro. A dimer from 4cro was extracted and a new pdb was built by superimposing the recognition helices of one monomer from each dimer.

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