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PopSet and UniGene), proteins (Protein, the Conserved Domain Database (CDD), COBALT, Conserved Domain Architecture Retrieval Tool (CDART), the Molecular Modeling Database (MMDB) and Protein Clusters) and chemicals (Biosystems and the Pub-Chem suite of small molecule databases). The Entrez system provides search and retrieval operations for most of these databases. Augmenting many of the web applications are custom implementations of the BLAST program optimized to search specialized datasets.doi:10.1093/nar/gkr1184 pmid:22140104 pmcid:PMC3245031 fatcat:zxmwupa435gfzcpusnv7oe3qnm