Fig. 9
From: An affinity-structure database of helix-turn-helix: DNA complexes with a universal coordinate system
Constraints for ICP correspondence. a Atom types are respected when performing ICP, so that a C1’ atom in one complex always corresponds to a C1’ atom in another complex. An example of a correspondence between the backbone atoms of two nucleotides in two complexes is shown. b Topology is preserved when performing ICP, so that the relative order of atoms (as defined by the DNA sequence) is the same between corresponded atoms. Left correspondence shows a correct (topology-preserving) example, while the right correspondence shows an incorrect (topology-violating) example