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Venn diagrams for common and uniq KCF Substructures in the KEGG COMPOUND, KEGG DRUG, KNApSAcK databases. The numbers of (a) KCF-Substructures, (b) BOND and TRIPLET entries, (c) VICINITY and INORGANIC entries, and (d) RING and SKELETON entries are shown in the top and bottom, respectively.
