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A) ChIP qPCR of Oct1 (Slc22a1), Oat1 (Slc22a6) and Oat3 (Slc22a8) promoters using an HNF4α antibody. Two loci outside of annotated coding or transcribed regions on chromosome 1 and 4 were used as negative controls. B) Schematic workflow of the chromatin immunoprecipitation qPCR experiment.
