The percentage of runners with impairment of hemoglobin degradation metabolites, myoglobin (>1,000 ng/ml), TB, and IB (>1.2 μg/ml) was also enhanced in RR (40, 36 and 14%, respectively) compared to XX genotype (19, 19 and 6%, respectively) (Figures 4B–D). The gene discussed is MB; the disease is tuberculosis.