Summary: The PPI3D web server is focused on searching and analyzing the structural data on protein-protein interactions. Reducing the data redundancy by clustering and analyzing the properties of interaction interfaces using Voronoi tessellation makes this software a highly effective tool for addressing different questions related to protein interactions.
Availability and implementation: The server is freely accessible at http://bioinformatics.lt/software/ppi3d/ .
Contact: ceslovas.venclovas@bti.vu.lt.
Supplementary information: Supplementary data are available at Bioinformatics online.
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