Results of an EMSA for the -1830 T > C polymorphism using nuclear extracts obtained from Hep3B cells. (A) Nucleotide sequences of oligonucleotides used as probes and competitors. (B) Differential binding of a nuclear protein to -1830 T > C alleles. (C) Identification of the transcription factor binding to 1830 T > C probe using competitive binding assay. EMSA, electrophoretic mobility shift assay.