Chado 

Chado is a relational database schema that underlies many GMOD installations. It is capable of representing many of the general classes of data frequently encountered in modern biology such as sequence, sequence comparisons, phenotypes, genotypes, ontologies, publications, and phylogeny. It has been designed to handle complex representations of biological knowledge and should be considered one of the most sophisticated relational schemas currently available in molecular biology. The price of this capability is that the new user must spend some time becoming familiar with its fundamentals. Chado makes extensive use of controlled vocabularies to type all entities in the database, so there is a feature table where gene, transcripts, exons, transposable elements, etc. are stored and their type is provided by the Sequence Ontology. When a new datatype comes along, the feature table requires no modification, only an update of the data in the database. The same is largely true of analysis data that can be stored in Chado as well. The existing core modules of Chado are: sequence - for sequences/features ; cv - for controlled-vocabs/ontologies ; general - currently just dbxrefs ; organism - taxonomic data ; pub - publication and references ; companalysis - augments sequence module with computational analysis data ; map - non-sequence maps ; genetic - genetic and phenotypic data ; expression - gene expression. (wikipedia)