PRDX2 and obstructive sleep apnea syndrome: One of these proteins, the redox regulators PRDX2 and GAPDH, were further validated in an independent cohort of patients by nonreducing WB using antibodies (Ab) against cysteine (Cys) sulfinylated/sulfonylated (SO2/3) of either PRDX2 or GAPDH to better evaluated the redox–oligoform behavior of these proteins in OSA RBC or OSA RBC under PAP.