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Literature

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

Health

ClinVar
human variations of clinical significance
dbGaP
genotype/phenotype interaction studies
GTR
genetic testing registry
MedGen
medical genetics literature and links
OMIM
online mendelian inheritance in man
PubMed Health
clinical effectiveness, disease and drug reports

Genomes

Assembly
genome assembly information
BioCollections
museum, herbaria, and other biorepository collections
BioProject
biological projects providing data to NCBI
BioSample
descriptions of biological source materials
Clone
genomic and cDNA clones
dbVar
genome structural variation studies
Genome
genome sequencing projects by organism
GSS
genome survey sequences
Nucleotide
DNA and RNA sequences
Probe
sequence-based probes and primers
SNP
short genetic variations
SRA
high-throughput DNA and RNA sequence read archive
Taxonomy
taxonomic classification and nomenclature catalog

Genes

EST
expressed sequence tag sequences
Gene
collected information about gene loci
GEO DataSets
functional genomics studies
GEO Profiles
gene expression and molecular abundance profiles
HomoloGene
homologous gene sets for selected organisms
PopSet
sequence sets from phylogenetic and population studies
UniGene
clusters of expressed transcripts

Proteins

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

Chemicals

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