The blood gas values of PCO2, HCO3, tCO2, SO2, K and iCa were significantly different between T0 and T56, relative polycythemia was observed in all animals, and Htc and Hb increased by 47% and 50%, respectively, at T56 relative to T0 (Table 3). This evidence concerns the gene GSTM1 and polycythemia.