Biological databases are stores of biological information. The journal Nucleic Acids Research regularly publishes special issues on biological databases and has a list of such databases. The 2018 issue has a list of about 180 such databases and updates to previously described databases. Omics Discovery Index can be used to browse and search several biological databases. Meta databases Meta databases are databases of databases that collect data about data to generate new data. They are capable of merging information from different sources and making it available in a new and more convenient form, or with an emphasis on a particular disease or organism.[metadatabase is a database model for metadata management, global query of independent database, and distributed data processing. The word metadatabase is an addition to the dictionary]. originally ,metadata was only common term referring simply to data about data such a tags ,keywords, and markup headers. ConsensusPathDB: a molecular functional interaction database, integrating information from 12 others Entrez (National Center for Biotechnology Information) Neuroscience Information Framework (University of California, San Diego): integrates hundreds of neuroscience relevant resources; many are listed below Model organism databases Model organism databases provide in-depth biological data for intensively studied organisms. PomBase: the knowledgebase for the fission yeast Schizosaccharomyces pombe SubtiWiki: integrated database for the model bacterium Bacillus subtilis Nucleic acid databases DNA databases The primary databases make up the International Nucleotide Sequence Database (INSD). The include: DNA Data Bank of Japan (National Institute of Genetics) EMBL (European Bioinformatics Institute) GenBank (National Center for Biotechnology Information) DDBJ (Japan), GenBank (USA) and European Nucleotide Archive (Europe) are repositories for nucleotide sequence data from all organisms. All three accept nucleotide sequence submissions, and then exchange new and updated data on a daily basis to achieve optimal synchronisation between them. These three databases are primary databases, as they house original sequence data. They collaborate with Sequence Read Archive (SRA), which archives raw reads from high-throughput sequencing instruments. Secondary databases are: 23andMe's database HapMap OMIM (Online Mendelian Inheritance in Man): inherited diseases RefSeq 1000 Genomes Project: launched in January 2008. The genomes of more than a thousand anonymous participants from a number of different ethnic groups were analyzed and made publicly available. EggNOG Database: a hierarchical, functionally and phylogenetically annotated orthology resource based on 5090 organisms and 2502 viruses. It provides multiple sequence alignments and maximum-likelihood trees, as well as broad functional annotation. Other databases Nucleosome positioning region database