The National Center for Biotechnology Information (NCBI) provides a comprehensive suite of database resources for molecular biology research. These resources, accessible through the NCBI home page, include Entrez, PubMed, PubMed Central (PMC), LocusLink, the NCBI Taxonomy Browser, BLAST, BLAST Link (BLink), Electronic PCR (e-PCR), Open Reading Frame (ORF) Finder, References Sequence (RefSeq), UniGene, HomoloGene, ProtEST, Database of Single Nucleotide Polymorphisms (dbSNP), Human/Mouse Homology Map, Cancer Chromosome Aberration Project (CCAP), Entrez Genomes, Map Viewer, Model Maker (MM), Evidence Viewer (EV), Clusters of Orthologous Groups (COGs) database, Retroviral Genotyping Tools, SAGEmap, Gene Expression Omnibus (GEO), Online Mendelian Inheritance in Man (OMIM), the Molecular Modeling Database (MMDB), the Conserved Domain Database (CDD), and the Conserved Domain Architecture Retrieval Tool (CDART). These tools facilitate data retrieval, sequence similarity searches, gene-level sequence analysis, genome-scale analysis, and the analysis of gene expression and phenotypes. The resources are designed to support a wide range of biological research and are continuously updated to include the latest data and improvements.The National Center for Biotechnology Information (NCBI) provides a comprehensive suite of database resources for molecular biology research. These resources, accessible through the NCBI home page, include Entrez, PubMed, PubMed Central (PMC), LocusLink, the NCBI Taxonomy Browser, BLAST, BLAST Link (BLink), Electronic PCR (e-PCR), Open Reading Frame (ORF) Finder, References Sequence (RefSeq), UniGene, HomoloGene, ProtEST, Database of Single Nucleotide Polymorphisms (dbSNP), Human/Mouse Homology Map, Cancer Chromosome Aberration Project (CCAP), Entrez Genomes, Map Viewer, Model Maker (MM), Evidence Viewer (EV), Clusters of Orthologous Groups (COGs) database, Retroviral Genotyping Tools, SAGEmap, Gene Expression Omnibus (GEO), Online Mendelian Inheritance in Man (OMIM), the Molecular Modeling Database (MMDB), the Conserved Domain Database (CDD), and the Conserved Domain Architecture Retrieval Tool (CDART). These tools facilitate data retrieval, sequence similarity searches, gene-level sequence analysis, genome-scale analysis, and the analysis of gene expression and phenotypes. The resources are designed to support a wide range of biological research and are continuously updated to include the latest data and improvements.