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rs5839491 is one of four SNPs all describing an insertion/deletion polymorphism in the promoter region of the UGT1A1 gene; the primary entry in SNPedia for this set of SNPs is at rs34815109.
The other two SNPs (besides rs34815109) that also describe the same polymorphism are:
[PMID 20528568] Evaluation of UGT1A1 and SULT1A1 polymorphisms with lipid levels in women with different hormonal status.