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The rank column corresponds to the ordinal rank of the p-value compared to the p-value of other ontology terms. Output is sorted by region-based binomial p-value, so one might expect these numbers to be consecutive. However, GREAT has additional filters applied in its default display: displayed terms must also be significant by the gene-based hypergeometric test and must have a region-based fold enrichment of 2 or more. These filters may then cause some terms prioritized highly by the region-based binomial p-value alone to not be visualized.

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