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# NUCLEOTIDE DATABASES ##### NCBI's sequence databases accept genome data from sequencing projects from around the world and serve as the cornerstone of bioinformatics research.
#### GenBank: An annotated collection of all publicly available nucleotide and amino acid sequences.
#### EST database: A collection of expressed sequence tags, or short, single-pass sequence reads from mRNA (cDNA).
#### GSS database: A database of genome survey sequences, or short, single-pass genomic sequences.
#### HomoloGene: A gene homology tool that compares nucleotide sequences between pairs of organisms in order to identify putative orthologs.
#### HTG database: A collection of high-throughput genome sequences from large-scale genome sequencing centers, including unfinished and finished sequences.
#### SNPs database: A central repository for both single-base nucleotide substitutions and short deletion and insertion polymorphisms.
#### RefSeq: A database of non-redundant reference sequences standards, including genomic DNA contigs, mRNAs, and proteins for known genes. Multiple collaborations, both within NCBI and with external groups, support our data-gathering efforts.
#### STS database: A database of sequence tagged sites, or short sequences that are operationally unique in the genome.
#### UniSTS: A unified, non-redundant view of sequence tagged sites (STSs).
#### UniGene: A collection of ESTs and full-length mRNA sequences organized into clusters, each representing a unique known or putative human gene annotated with mapping and expression information and cross-references to other sources.

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