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NCBI Databases

Literature

The World's largest repository of medical and scientific abstracts, full-text articles, books and reports

Bookshelf

Books and reports

MeSH

Ontology used for PubMed indexing

NLM Catalog

Books, journals and more in the NLM Collections

PubMed

Scientific and medical abstracts/citations

PubMed Central

Full-text journal articles

Genes

Gene sequences and annotations used as references for the study of orthologs structure, expression, and evolution

Gene

Collected information about gene loci

GEO DataSets

Functional genomics studies

GEO Profiles

Gene expression and molecular abundance profiles

HomoloGene

Homologous genes sets for selected organisms

PopSet

Sequence sets from phylogenetic and population studies

Proteins

Protein sequences, 3-D structures, and tools for the study of functional protein domains and active sites

Conserved Domains

Conserved protein domains

Identical Protein Groups

Protein sequences grouped by identity

Protein

Protein sequences

Protein Clusters

Sequence similarity-based protein clusters

Sparcle

Functional categorization of proteins by domain architecture

Structure

Experimentally-determined biomolecular structures

Genomes

Genome sequence assemblies, large-scale functional genomics data, and source biological samples

Assembly

Genome assembly information

BioCollections

Museum, herbaria, and other biorepository collections

BioProject

Biological projects providing data to NCBI

BioSample

Descriptions of biological source materials

Genome

Genome sequencing projects by organism

Nucleotide

DNA and RNA sequences

Probe

Sequence-based probes and primers

SRA

High-throughput sequence reads

Taxonomy

Taxonomic classification and nomenclature

Genetics

Heritable DNA variations, associations with human pathologies, and clinical diagnostics and treatments

ClinVar

Human variations of clinical significance

dbGaP

Genotype/phenotype interaction studies

dbSNP

Short genetic variations

dbVar

Genome structural variation studies

GTR

Genetic testing registry

MedGen

Medical genetics literature and links

OMIM

Online mendelian inheritance in man

Chemicals

Repository of chemical information, molecular pathways, and tools for bioactivity screening

BioSystems

Molecular pathways with links to genes, proteins and chemicals

PubChem BioAssay

Bioactivity screening studies

PubChem Compound

Chemical information with structures, information and links

PubChem Substance

Deposited substance and chemical information

BLAST

Basic Local Alignment Search Tool

BLAST is a tool for comparing an amino acid or nucleotide sequence to an entire sequence library, identifying regions of high sequence similarity.

More options

Video tutorial

VIDEO: NCBI Minute: Using organism (taxonomic) information with standalone BLAST

NCBI Minute: Using organism (taxonomic) information with standalone BLAST

Limiting a BLAST search to particular organism or taxonomic group is important for making BLAST searches efficient. This also produces results that are easier to ...

 View at YouTube

Recent blog posts

August 19, 2019

How well do you know GeneReviews®?

You may know . . . We offer expert-authored, peer-reviewed chapters on more than 750 genetic disorders. Our standardized format enables busy ...

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August 6, 2019

May-July 2019 RefSeq annotations include newly annotated organisms like octopus, two-lined caecelian

Recently, the NCBI Eukaryotic Genome Annotation Pipeline has released new annotations in RefSeq for the following organisms: Acropora millepora (stony coral) Acyrthosiphon ...

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August 1, 2019

The new BLAST results are now the default view

As you may know, we have been offering a new BLAST results (Figure 1) as a test page since April. In response ...

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Recent videos

VIDEO: NCBI Minute: An Updated PubMed is on its Way!

NCBI Minute: An Updated PubMed is on its Way!

This video highlights the main features you can expect in the new PubMed, including those already available in PubMed Labs. A timeline is included, as ...

 View at YouTube

VIDEO: Introducing the Genome Submission Wizard in Genome Workbench v3.0

Introducing the Genome Submission Wizard in Genome Workbench v3.0

Genome Workbench version 3 is a major upgrade, including the addition of the Genome Submission Wizard. This video guides you through the wizard, from uploading ...

 View at YouTube

VIDEO: NCBI Minute: Using organism (taxonomic) information with standalone BLAST

NCBI Minute: Using organism (taxonomic) information with standalone BLAST

Limiting a BLAST search to particular organism or taxonomic group is important for making BLAST searches efficient. This also produces results that are easier to ...

 View at YouTube