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Figure 19 Bacteriophage lambda Cro repressor protein is a homodimer. It is represented here in three ways. (a) Ribbon format, with the subunits coloured differently. (b) Space-filling format with the subunits coloured as in (a). (c) Ribbon format with the polypeptide backbone coloured according to secondary structure: α helix, red; β sheet, cyan; turn, green; random coil, white. (Based on pdb file 1cop)

 1.5 Quaternary structure