JUNB and rheumatoid arthritis: Only major allele variants were detected for SNPs in the promoters of JUNB and JUND. In the JUN promoter, 1 SNP was detected at position -1676 (C/G, major allele: C; rs4647001, position given in regard to the start codon) in 1 RA sample and another SNP at position -617/-618 (insertion CA; major allele: Without insertion; rs4647009) in 2 RA samples.