The pattern of agarose gel electrophoresis of the MTRR A66G PCR products. Lane 1 depicts PCR product (198 bp), lane 2 indicates heterozygous allele (198, 175, 23 bp), lane 3 shows wild allele (198 bp) and lane 5 shows mutant allele (175, 23 bp). Lane 6 indicates a 50-bp molecular weight ladder.