Figure 1: A representative picture of PCR-RFLP of PTPN22 C1858T on 2.5% Agarose gel: lanes 1-4 and 6-8 show homozygous 1858CC genotype with 176 bp and 42 bp bands. Lane 5 shows heterozygous 1858CT genotype with 218 bp, 176 bp and 42 bp bands, last lane is 50 bp ladder.