Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Literature

PubMed

PubMed® comprises more than 35 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

Featured Bookshelf titles

LiverTox

Clinical and Research Information on Drug-Induced Liver Injury

Browse the Bookshelf

Literature databases

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

Data

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 Family Models

Models representing homologous proteins with a common function

Structure

Experimentally-determined biomolecular structures

BLAST

A tool to find regions of similarity between biological sequences

blastn

Search nucleotide sequence databases

blastp

Search protein sequence databases

blastx

Search protein databases using a translated nucleotide query

tblastn

Search translated nucleotide databases using a protein query

Primer-BLAST

Find primers specific to your PCR template

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

SRA

High-throughput sequence reads

Taxonomy

Taxonomic classification and nomenclature

Clinical

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

ClinicalTrials.gov

Privately and publicly funded clinical studies conducted around the world

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

PubChem

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

BioAssays

Bioactivity screening studies

Compounds

Chemical information with structures, information and links

Pathways

Molecular pathways with links to genes, proteins and chemicals

Substances

Deposited substance and chemical information

News

Research news

The Washington Post JUNE 5, 2023

Cancer patients are confronting widespread shortages of chemotherapy drugs

Chemotherapy drugs, particularly those used to treat kids’ cancers, are among those medications experiencing some of the most prolonged shortages.

The Washington Post JUNE 4, 2023

Native American women face heart risks while pregnant, group says

The majority of Native American and Alaska Native women already have heart problems when they become pregnant, the researchers write.

More news

Recent blog posts

NLM Musings YESTERDAY

Can Studying Viruses Help Us Understand the Evolution of Life?

One fascinating question my group asked was, might it be possible to peer into the distant past and figure out what viruses were infecting our distant ancestors? Our conclusions were rather remarkable.

NCBI Insights YESTERDAY

Important Update! Changes to ASSEMBLY_REPORTS and GENOME_REPORTS on FTP

Do you currently access genome assembly data through the FTP site? We are consolidating information provided in the ASSEMBLY_REPORTS and GENOME_REPORTS directories on the genomes FTP site to simplify access and ensure that you have the most accurate, up to date, and consistently reported data.   The assembly_summary files in the ASSEMBLY_REPORTS directory are gaining information … Continue reading Important Update! Changes to ASSEMBLY_REPORTS and GENOME_REPORTS on FTP

NCBI Insights JUNE 6, 2023

A Modernized ClinicalTrials.gov Website is Coming

In June 2023, the modernized version of ClinicalTrials.gov will become the primary site. This is a multi-year effort to modernize ClinicalTrials.gov to deliver an improved user experience on an updated platform that will accommodate future growth and enhance efficiency. In response to your feedback, the updated website includes a modern look and feel as well … Continue reading A Modernized ClinicalTrials.gov Website is Coming