GenBank is an annotated collection of all publicly available DNA sequences. It is a part of the International Nucleotide Sequence Database Collaboration, which comprises the DNA DataBank of Japan, the European Nucleotide Archive, and the GenBank at NCBI. The GenBank and European Nucleotide Archive repositories contain annotated collections of publicly available DNA sequences. GenBank is divided into three divisions; the main collection is CoreNucleotide; dbEST, which is a collection of short single-read transcript sequences from GenBank; and dbGSS (Genome Survey Sequences), which is a collection of unannotated short single-read primarily genomic sequences from GenBank, including random survey sequences, clone-end sequences, and exon-trapped sequences.