The properties of 1172 protein complexes (downloaded from the Protein Data\nBank (PDB)) have been studied based on the concept of circular variance as a buriedness\nindicator and the concept of mutual proximity as a parameter-free definition of contact.\nThe propensities of residues to be in the protein, on the surface or form contact, as well as\nresidue pairs to form contact were calculated. In addition, the concept of circular variance\nhas been used to compare the ruggedness and shape of the contact surface with the overall\nsurface.
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