LinkOut Banner

Other LinkOut Resources by SubjectType

The following LinkOut providers, listed by SubjectType, supply links to web-accessible resources other than full text, including datasets and databases, from NCBI databases. A list of Other LinkOut Resources by provider name is also available.
Some providers may require user registration or subscription fees, or have other stipulations for access to their resources. Policies vary by provider. Clicking on one of the links below will search a NCBI database for records with links to that resource.
As of February 22, 2019, there are 265 resources participating in LinkOut.
biological properties clinical trials clones/clone libraries companies/research institutes consumer health culture/stock collections diagnostics disease organizations DNA/protein sequence gene expression gene/protein/disease-specific herbarium/museum collections images institutional repository locus-specific mapping meta-databases molecular interactions organism-specific other reagents patent databases population/variation protein identification/characterization protein interactions/pathways sequence screening/similarity/alignment structure supplemental materials taxonomy/phylogenetic toxicology treatment guidelines vendors Miscellaneous

Chemical Information

biological properties (total: 2) Information about chemicals with biological activity.
AlzPED National Institute on Aging (AlzPED) PubMed
SIDER Side Effect Resource (SIDER) pccompound
molecular interactions (total: 3) Information about chemicals which interact or bind to other molecules (for example, protein-protein or small molecule-protein interactions)
BindingDB (BindingDB) PubMed
Ingenuity Pathways Analysis (Ingenuity) Gene pccompound
Interologous Interaction Database (I2D) Gene
toxicology (total: 1) Information on chemicals investigated for their toxic effect.
Hazardous Substances Data Bank (HSDB) PubMed
vendors (total: 2) Information from commercial distributors of chemicals.
MilliporeSigma (milliporesigma) Gene
Novus Biologicals (novbiol) Gene


clinical trials (total: 2) Links from NCBI database records to resources providing information about relevant ongoing and upcoming clinical trials, including information on locating, applying to, or participating in clinical trials. (CTgov) PubMed
The YODA Project (yodapro) PubMed
consumer health (total: 4) Links from NCBI database records to relevant resources or materials intended to educate or inform the general public about particular health topics or issues.
Genetic Alliance (GA) PubMed
Genetics Home Reference (GHR) Gene PubMed
Household Products Database (HPD) PubMed
MedlinePlus Health Information (MEDPLUS) PubMed
diagnostics (total: 1) Resources providing information on the signs, symptoms and diagnosis of diseases, syndromes, or conditions relevant to specific NCBI database records
International Agency for Research on Cancer - Screening Group (IARCSCR) PubMed
disease organizations (total: 1) Institutions, groups, or other organizations whose work is focused on the research of particular diseases or conditions, or that offer information, support, and/or other resources to people suffering from particular diseases or conditions.
Breast Cancer Now TissueBank Bioinformatics Portal (bcntbbp) Gene
treatment guidelines (total: 1) Resources offering treatment guidelines or information on treatment guidelines for particular diseases, syndromes, or conditions relevant to specific NCBI database records.
HIV InSite (HIVinsite) PubMed

Molecular Biology Databases

DNA/protein sequence (total: 6) Databases providing nucleotide or amino acid sequence data.
BioCyc (BioCyc) Protein PubMed Taxonomy
CryptoDB: Cryptosporidium Genome Resources (CryptoDB) Nucleotide Protein
Ensembl (ensem) Nucleotide Protein
IMGT, the international ImMunoGeneTics information system (IMGT) Nucleotide
PANTHER Classification System (PANTHER) Gene Protein
VirOligo Compilation Lab (VirOligo) Nucleotide PubMed Taxonomy
gene expression (total: 9) Databases providing data on gene expression (e.g., RNA transcription, knockouts).
Allen Brain Atlas (ABA) Gene
Bio-Analytic Resource (bioarray) Gene Protein
GEISHA - In Situ Hybridization Database (geishap) Gene
GeneNetwork (GeneNetwork) Gene
Genevisible (Genevisible) Gene
Human eFP Browser (humanefp) Gene
Immunological Genome Project (ImmGen) Gene
Model Organism Protein Expression Database (moped) Protein
Nuclear Receptor Signaling Atlas (NURSA) (nursa) Gene pccompound PubMed
gene/protein/disease-specific (total: 29) Databases providing data specific to particular genes, proteins, diseases, syndromes, or conditions
BioCyc (BioCyc) Protein PubMed Taxonomy
BioGPS (BioGPS) Gene
COMputational BRidges to Experiments (combrex) Gene
cpnDB: A Chaperonin Database (cpnDB) Nucleotide Protein
CREB Target Gene Database (CREBDB) Gene
CTD: Comparative Toxicogenomics Database (comtoxdb) Gene
Domain Mapping of Disease Mutations (DMDM) CDD Gene Protein
Eukaryotic Promoter Database (EPD) Gene
GenAge Database of Aging Related Genes (genage) Gene
Gene Ontology (GeneOntol) PubMed
The Gene Wiki (genewik) Gene
GenScript latest version of gene cDNA ORF Clone (genscript) Gene Nucleotide
Guide to Pharmacology (guidpharm) Gene Nucleotide Protein PubMed
Immune Epitope Database and Analysis Resource (iedb) PubMed Taxonomy
Influenza Research Database (IRD) Nucleotide Protein
InnateDB (IDB) Gene
Institute for Transcriptional Informatics (IFTI) Nucleotide Protein PubMed
InterMine (InterMine) Gene
KOMP Repository (komp) Gene Nucleotide PubMed
Monarch Initiative (Monarch) Gene
NIA Mouse Gene Index (NIA_MGI) Gene
Nuclear Receptor Signaling Atlas (NURSA) (nursa) Gene pccompound PubMed
PhosphoSitePlus (phospho) Gene PubMed
REBASE - The Restriction Enzyme Database (REBASE) Protein PubMed
SeekQuence Research Antibodies (seekquence) Gene
Stanford HIV Drug Resistance Database (hivdb) PubMed
Vertebrate Genome Annotation (VEGA) database (Vega) Gene
Virus Pathogen Resource (ViPR) Nucleotide Protein
The Weizmann Institute of Science GeneCards and MalaCards databases (WeizmannInst) Gene PubMed
locus-specific (total: 3) Databases, often described as LSDB, focusing on a single gene or a small family of genes.
LSDB from Gene (LSDB) Gene
Ribosomal Database Project II (RDP) BioProject Nucleotide
SILVA (silva) BioProject Nucleotide PubMed
mapping (total: 1) Databases providing chromosomal mapping data, such as sequence tagged site (STS) mapping.
The DNA Replication Origin Database (OriDB) PubMed
meta-databases (total: 6) Databases that draw and/or synthesize information from other databases and extend or add value to the original information.
BacDive (bacdive) Nucleotide PubMed Taxonomy
Broadly Neutralizing Antibody Electronic Resource (bnaber) Nucleotide
PANTHER Classification System (PANTHER) Gene Protein
Pharmacogenomics Knowledge Base (PharmGKB) Gene PubMed
Protein Ontology Consortium (procdb) Gene Protein
Reactome (Reactome) Gene Protein
organism-specific (total: 24) Databases providing data specific to a particular organism or group of organisms.
The Arabidopsis Information Resource (TAIR) PubMed
Bio-Analytic Resource (bioarray) Gene Protein
BioCyc (BioCyc) Protein PubMed Taxonomy
C. elegans Genome Database (WormBase) Nucleotide
diArk - a resource for eukaryotic genome research (diArk) Taxonomy
FlyBase (FlyBase) Nucleotide Protein PubMed
Genomes On Line Database (GOLD) BioProject Taxonomy
Gramene (Gramene) Nucleotide
Integrated Microbial Genomes (img) BioProject Taxonomy
LANL HCV Databases (lanlhcv) Nucleotide PubMed
LANL Hemorrhagic Fever Virus sequence database (hfvweb) Nucleotide PubMed
LANL HIV Databases (HIVWeb) Nucleotide PubMed
Monkey Alcohol and Tissue Research Resource (matrr) PubMed
Mouse Genome Informatics (MGI) (MGI) Nucleotide Protein PubMed
Mouse Phenome Database (MPD) (mouphenod) PubMed
New Crops Resource Online Program (NewCROP) Taxonomy
OrthoDB catalog of orthologs (orthodb) Gene Protein
PomBase, University of Cambridge (pombase) PubMed
Saccharomyces Genome Database (SGD) Protein PubMed
USDA Crop Germplasm Committee Reports (USDAcgc) Taxonomy
WebScipio - eukaryotic gene identification (WebScipio) Taxonomy
Xenbase (xenbase) Gene PubMed
Yeast Functional Genomics Database (YFGdb) PubMed
population/variation (total: 2) Databases providing data on sequence variation within particular populations, including mutations or other polymorphisms.
ALFRED: The Allele Frequency Database (ALFRED) SNP
Human Gene Mutation Database (HGMD) Gene
protein interactions/pathways (total: 5) Databases that describe molecular interactions and/or biological pathways.
EAWAG Biocatalysis/Biodegradation Database (umbbd) PubMed
Ingenuity Pathways Analysis (Ingenuity) Gene pccompound
iRefWeb - iRefIndex release 9.0 - Consolidated Interactome (cairefweb) Gene
Kyoto Encyclopedia of Genes and Genomes (KEGG) Gene
SABIO-RK (sabiork) PubMed
structure (total: 2) Databases providing structural or pattern data, such three-dimensional protein structures, chemical structures, or two-dimensional electrophoresis patterns.
MODBASE, Database of Comparative Protein Structure Models (Sali Lab/UCSF) (modbase) Protein
ModelDB (modeldb) PubMed
taxonomy/phylogenetic (total: 74) Databases providing data on organism taxonomy, phylogenetic trees and relationships, or biodiversity.
AlgaeBase (AlgaeBase) Taxonomy
American Phytopathological Society (APpS) Taxonomy
Amphibian Species of the World (ASW) Taxonomy
AmphibiaWeb (amphiweb) Taxonomy
Angiosperm Phylogeny Website (APweb) Taxonomy
Animal Diversity Web (ADW) Taxonomy
AnimalBase (AnimalBase) Taxonomy
AntWeb (AntWeb) Nucleotide Taxonomy
Arctos Specimen Database (Arctos) BioSample Nucleotide Taxonomy
Area de Conservacion Guanacaste (ACG) Taxonomy
Barcodes of Life (BoLD) Nucleotide Taxonomy
Bee Genera of the World (BeeGen) Taxonomy
Beetles of Florida (ColeoFla) Taxonomy
Bugwood Network (University of Georgia) (Bugwood) Taxonomy
Butterflies and Moths of the World (ButMoth) Taxonomy
CalPhotos (CalPhotos) Taxonomy
Catalog of Sphecidae (sphecids) Taxonomy
Checklist of World Ferns (ferns) Taxonomy
Coleoptera Home Page (beetles) Taxonomy
The Conus Biodiversity Website (ConusBiodiversity) Taxonomy
CortBase (cortbase) Taxonomy
CyanoDB (CyanoDB) Taxonomy
The Cycad Pages (cycads) Taxonomy
Descriptions of Plant Viruses (DPV) Taxonomy
electronic Plant Information Centre (ePIC) Taxonomy
emerencia (emerencia) Nucleotide
Encyclopedia of life (encylife) Taxonomy
Flowering Plant Gateway (FPG) Taxonomy
Global Biotic Interactions (GloBI) Taxonomy
GyroDb (GyroDb) Taxonomy
Index Fungorum (Fungorum) Taxonomy
Index Nominum Algarum (INA) Taxonomy
Index Nominum Genericorum (ING) Taxonomy
Integrated Taxonomic Information System (ITIS) Taxonomy
International Committee on Taxonomy of Viruses (ICTV) Taxonomy
The International Plant Names Index (IPNI) Taxonomy
iPhylo (iPhylo) Taxonomy
ISHAM ITS Database (ishamITS) Nucleotide
Lepidoptera (Markku Savela) (lepidoptera) Taxonomy
Lifemap (lifemap) Taxonomy
List of Bacterial names with Standing in Nomenclature (LBSN) Taxonomy
Mammal Species of the World (MSW) Taxonomy
Mammals of Texas (MamTex) Taxonomy
Multidimensional scaling and linear discriminant analsys for viral sequence classification (muldas) Nucleotide Protein
MycoBank (MycoBank) Taxonomy
NCBI taxonomy bookmarks (taxresource) Taxonomy
NHGRI genome proposal white papers (nhgriwp) Taxonomy
Nomenclature of Eumycetozoa (eumycetozoa) Taxonomy
Ocean Biogeographic Information System (OBIS) Taxonomy
OMA Browser: Orthologous MAtrix (OMA) Gene Protein Taxonomy
The Parasitic Plant Connection (PPlants) Taxonomy
PescaBase (pescabase) Taxonomy
Plant and Insect Parasitic Nematodes (PIPnemas) Taxonomy
Plant Bugs of the World (Miridae) Taxonomy
PLANTS Database (USDA/NRCS) (PLANTS) Taxonomy
Plazi (plazi) Taxonomy
Primate Fact Sheets (PFacts) Taxonomy
The Scorpion Files (ScoFiles) Taxonomy
Sea Slug Forum (seaslugs) Taxonomy
Smithsonian: North American Mammals (sinam) Taxonomy
Species 2000 (sp2000) Taxonomy
Studies in the Amanitaceae (amanita) Taxonomy
Systematic Mycology and Microbiology Laboratory, Fungal Databases (SBML) Taxonomy
TIGR Reptile Database (tigrrep) Taxonomy
Tree of Life (ToL) Taxonomy
TreeBase (TreeBase) Taxonomy
UCMP phylogeny exhibit (UCMP) Taxonomy
UNITE (unite) Nucleotide
USDA-ARS GRIN Taxonomy (GRINTAX) Taxonomy
Vascular Tropicos (TROPICOS) Taxonomy
World Crustacea (Crustacea) Taxonomy
World Register of Marine Species (WoRMS) Taxonomy
ZooBank (zoobank) Taxonomy
Zoonomen Birds of the World (zoonomen) Taxonomy

Other Literature Sources

images (total: 6) Links to online images from the NCBI database records that they are relevant to or referenced by. (Bioimages) Taxonomy
Digital Morphology (DigiMorph) PubMed Taxonomy
Joseph Hughes (sp_jhughes) Taxonomy
MorphBank (MorphBank) Nucleotide Taxonomy
National Plant Photographic Index (NPPI) Taxonomy
The Parasitic Plant Connection (PPlants) Taxonomy
institutional repository (total: 32) Links to materials deposited to an online archive of an institution
Andalusian Health Repository (RSAndal) PubMed
Archivio Istituzionale della Ricerca Unimi (AIR) PubMed
Bern Open Repository and Information System (BORIS) PubMed
Chapman University Digital Commons (ChapmanUDC) PubMed
Cornell University - Hathi Trust (cornellht) PubMed
Corpus, Universite Laval (CorpusUL) PubMed
Digital CSIC Spanish National Research Council (DigitalCSIC) PubMed
Digital Repository of the University of Navarra (dadun) PubMed
Diposit Digital de la Universitat de Barcelona (ddubarcelona) PubMed
eScholarship, California Digital Library, University of California (eScholarship) PubMed
FIU Digital Commons (FIUdigital) PubMed
GoeScholar-Universitat Gottingen (goescholar) PubMed
HAL archives ouvertes (HALarchives) PubMed
IUPUI ScholarWorks (ScholarWorks) PubMed
K-State Research Exchange (krex) PubMed
Kyoto University Research Information Repository - Articles (kurenai2) PubMed
Linkoping University Electronic Press (linkoping) PubMed
London School of Hygiene and Tropical Medicine (LSHTM) PubMed
MLibrary (Deep Blue) (DeepBlue) PubMed
OAKTrust Digital Repository, Texas A&M (oaktrust) PubMed
Okayama University Scientific Achievement Repository (OUSAR) PubMed
ORBi (University of Liege) (ORBi) PubMed
Rice Digital Scholarship Archive (RiceDSA) PubMed
RiuNet Universitat Politecnica de Valencia (RiuNetUPV) PubMed
Spiral, Imperial College Digital Repository (spiral) PubMed
Swarthmore College Works (SwarthmoreWorks) PubMed
Touro Scholar (touroscholar) PubMed
Universidad Autonoma de Madrid Biblos-e Archivo (uamarchivo) PubMed
University of Lausanne/CHUV - Serval (serval) PubMed
University of Nebraska-Lincoln Digital Commons (UNLDigitalCommons) PubMed
University of Turin Institutional Repository AperTO (AperTO) PubMed
White Rose Research Online (wrro) PubMed
patent databases (total: 1) Links to patent database records from PubMed citations of publications discussing patented products (including proteins and DNA sequences) or processes, or from relevant NCBI database records
The Lens (lens) PubMed
supplemental materials (total: 10) Links to the materials directly supporting the research discussed in the cited article, including data sets from experiments/studies accessory graphics, images, sound, and multimedia files related to the article.
American Society for Microbiology - videos and podcasts (asmmedia) PubMed (DataMed) PubMed
Dryad Digital Repository (dryaddb) BioProject Gene Nucleotide Protein PubMed Taxonomy
figshare (figshare) PubMed
NCI caNanoLab Data Portal (ncicananolab) PubMed
NHGRI Bioinformatics and Scientific Programming Core (nhgribspc) PubMed
NIMH Data Archive (NDA) PubMed
Nuclear Receptor Signaling Atlas (NURSA) (nursa) Gene pccompound PubMed
Princeton University MicroArray database (PUMAdb) PubMed
Surface Management System Database (SumsDB) PubMed

Research Materials

clones/clone libraries (total: 7) Suppliers providing DNA clones and clone libraries (e.g., DNA, cDNA).
Addgene Non-profit plasmid repository (addgene) Gene PubMed
GeneCopoeia Inc. (genecopoeia) Gene Nucleotide
K.K. DNAFORM (dnaform) Nucleotide
Kazusa DNA Research Institute (Kazusa) Gene Nucleotide Taxonomy
NITE Biological Resource Center (NBRC) Gene Nucleotide
PlasmID Repository at Harvard Medical School (HIP) Gene Nucleotide
Sino Biological Inc. (sinobio) Gene Nucleotide
culture/stock collections (total: 10) Suppliers providing cell cultures.
American Type Culture Collection (ATCC) Nucleotide PubMed
Cellosaurus - a cell line knowledge resource (Cellosaurus) BioSample PubMed
Coriell Cell Repositories (CCR) Nucleotide PubMed Taxonomy
Global Catalogue of Microorganisms (GCM) Taxonomy
Herbarium, Real Jardin Botanico-CSIC. Madrid (MAFungi) Nucleotide Taxonomy
Jackson Laboratory JAX®Mice Database (JAXMice) PubMed
National BioResource Project (jpnbioresp) PubMed
StrainInfo (StrainInfo) BioProject Nucleotide PubMed Taxonomy
USDA-ARS GRIN Accessions (GRIN) Nucleotide Protein
Worm Systematic Resource Network (WSRN) Taxonomy
herbarium/museum collections (total: 12) Curated plant/animal specimen collections.
AntWeb (AntWeb) Nucleotide Taxonomy
Herbario Amazonico Colombiano, Instituto Amazonico de Investigaciones Cientificas Sinchi (COAHSinchi) Nucleotide Taxonomy
Imago Specimen Image Download (imagospe) Nucleotide
Indiana University Herbarium (IUHerbarium) Nucleotide
Indiana University Imago Repository (IUImago) Nucleotide
KU Biodiversity Institute (kubioinst) Nucleotide
Mycology Collections Portal (MyCoPortal) Nucleotide
National Fish Collection, Smithsonian Institution (usnmfish) Nucleotide
NMNH Collections, Smithsonian (sinmnhinfo) BioSample Nucleotide Protein
Royal Botanic Garden Edinburgh (rbge) Nucleotide
SANT Herbarium, Universidade de Santiago de Compostela. Galicia - Spain (santherbarium) Nucleotide Taxonomy
Zoonomen Birds of the World (zoonomen) Taxonomy
other reagents (total: 9) Suppliers providing other reagents not described by other SubjectTypes in this category.
Acrobiosystems Inc. (acrobiosys) Gene
antibodies-online (ABO) Gene PubMed
Creative Biomart (cbiomart) Gene
eagle-i research resources (eaglei) PubMed
ExactAntigen/Labome (EADB) Gene Nucleotide Protein
GeneCopoeia Inc. (genecopoeia) Gene Nucleotide
GeneTex Inc (genetex) Gene Protein PubMed
LifeSpan BioSciences, Inc. (lifespan) Gene Nucleotide Protein
USDA-ARS GRIN Accessions (GRIN) Nucleotide Protein


companies/research institutes (total: 1) Private companies or research institutions that have conducted or supported research cited in NCBI database records.
The Sanger Centre (Sanger) Taxonomy


protein identification/characterization (total: 2) Tools used in the identification, annotation, characterization, or other description of proteins.
Evolutionary Trace of Functional Site (lichtarge) Protein
GeneMANIA (GeneMANIA) Gene
sequence screening/similarity/alignment (total: 1) Tools used in screening, comparing, matching, and alignment of sequences.
UCSC Genome Browser (UCSCgb) Nucleotide Taxonomy


Miscellaneous (total: 8)
Biospecimen Research Database (ncibrd) PubMed
GeneWeaver (geneweaver) Gene PubMed (interologfinder) Gene
NCI CPTAC Assay Portal (assaysnci) PubMed
NCI CPTC Antibody Characterization Program (antibodynci) PubMed
OriGene (OriGene) Gene Nucleotide
SciCrunch (SciCrunch) PubMed
taxdemo (taxdemo) Taxonomy