Examples of different double-stranded DNAs bound to the same protein. (A) Protein-DNA complexes that have similar proteins but different DNA molecules (PDB IDs 1BGB and 2B0D). Adenines, thymines, guanines, cytosines, and backbone atoms are colored in red, blue, yellow, green, and brown, respectively. (B) Sequence alignment between the DNA sequences of 1BGB and 2B0D. (C) The dimer of P1 ParB fragments of plasmid partition par B protein (1ZX4) has two different DNA binding domains.