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Database of one-to-one ortholog information provided by the NCBI as a subset of their Gene resource. Used for users to access ortholog information for over 1000 species of vertebrates and arthropods.

A GI number (for GenInfo Identifier, sometimes written in lower case, _gi_) is a simple series of digits that are assigned consecutively to each sequence record processed by NCBI. The GI number bears no resemblance to the Version number of the sequence record. Each time a sequence record is changed, it is assigned a new GI number.

The NCBI Bookshelf provides free online access to books and documents in life science and healthcare. Search, read, and discover.

A database-specific registry supporting curation in the NCBI GenBank and related NCBI resources

This resource organizes information on genomes including sequences, maps, chromosomes, assemblies, and annotations.

Genetic code, mitochontrial genetic code, and other linked information to NCBI taxonomy entries.

The National Center for Advancing Translational Sciences](http://www.ncats.nih.gov/) (NCATS) has developed Inxight Drugs as a comprehensive portal for drug development information. NCATS Inxight Drugs contains information on ingredients in medicinal products, including: - US Approved Drugs - Marketed Drugs - Investigational Drugs - Other Substances

The NCATS BioPlanet is a comprehensive, publicly accessible informatics resource that catalogs all pathways, their healthy and disease state annotations, and targets within and relationships among them. The BioPlanet integrates pathway annotations from publicly available, manually curated sources subjected to thorough redundancy and consistency cross-evaluation via extensive manual curation. The browser supports interactive browsing, retrieval and analysis of pathways, exploration of pathway connections, and pathway search by gene targets, category, and availability of bioactivity assays.

Identifiers for subjects of experiments that investigate biological and health responses of terrestrial life to spaceflight

Identifiers for space-related data from studies that investigate biological and health responses of terrestrial life to spaceflight

Identifiers for payloads associated with experiments that investigate biological and health responses of terrestrial life to spaceflight

Identifiers for missions associated with experiments that investigate biological and health responses of terrestrial life to spaceflight

Identifiers for hardware used in experiments that investigate biological and health responses of terrestrial life to spaceflight

Identifiers for space-related data from experiments that investigate biological and health responses of terrestrial life to spaceflight

Identifiers for biospecimens used in experiments that investigate biological and health responses of terrestrial life to spaceflight

The nomenclature used for named reactions in text mining software from NextMove. While it's proprietary, there are a few publications listing parts. 487/1,855 have mappings to the Reaction Ontology (RXNO).

An ARK resolver as well as resolver built with common prefixes as in Identifiers.org

Mycobrowser is a resource that provides both in silico generated and manually reviewed information within databases dedicated to the complete genomes of Mycobacterium tuberculosis, Mycobacterium leprae, Mycobacterium marinum and Mycobacterium smegmatis. This collection references Mycobacteria leprae information.

The Metabolomics Workbench Metabolite Database contains structures and annotations of biologically relevant metabolites. As of 03/23/26, the database contains 175556 entries, collected from various public sources. [from homepage]

The main objective of RefMet is to provide a standardized reference nomenclature for both discrete metabolite structures and metabolite species identified by spectroscopic techniques in metabolomics experiments. [from homepage]

The Human Metabolome Gene/Protein Database (MGP) of metabolome-related genes and proteins contains data for over 7300 genes and over 15,500 proteins. [from homepage]

The CDC's National Center for Immunization and Respiratory Diseases ([NCIRD](https://www.cdc.gov/ncird/)) developed and maintains HL7 Table 0227, Manufacturers of Vaccines (MVX). It includes both active and inactive manufacturers of vaccines in the US. Inactive MVX codes allow transmission of historical immunization records. When [MVX code is paired with a CVX code](https://www2a.cdc.gov/vaccines/iis/iisstandards/vaccines.asp?rpt=tradename) (vaccine administered code), the specific trade named vaccine may be indicated.