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We developed a model of macromolecular interfaces based on the Voronoi diagram and the related alpha-complex, and we tested its properties on a set of 96 protein-protein complexes taken from the Protein Data Bank. The Voronoi model provides a natural definition of the interfaces, and it yields values of the number of interface atoms and of the interface area that have excellent correlation coefficients with those of the classical model based on solvent accessibility. Nevertheless, some atomsdoi:10.1110/ps.062245906 pmid:16943442 pmcid:PMC2242599 fatcat:dsadnchnrrf7dn3la6s7fo3pnm