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The Bejerano Lab at Stanford University developed the Genomic Regions Enrichment of Annotations Tool (GREAT) and hosts the GREAT web server at

Many coding genes are well annotated with their biological functions. Non-coding regions typically lack such annotation. GREAT assigns biological meaning to a set of non-coding genomic regions by analyzing the annotations of the nearby genes. Thus, it is particularly useful in studying cis functions of sets of non-coding genomic regions. Cis-regulatory regions can be identified via both experimental methods (e.g. chromatin immunoprecipitation followed by massively parallel sequencing) and by computational methods (e.g. sequence conservation in a given clade).