 ([Fig 0](#pone.0000000.g000){ref-type="fig"}, [S0 Table](#pone.0000000.s000){ref-type="supplementary-material"}).  ![Comparative effect of the pretreatment with resveratrol (RSV) or methylene blue (MET) on methemoglobin formation induced by DDS-NHOH.\ Erythrocytes were pre-incubated with RSV (000 μM) for 0 h or MET (00 nM) for 00 min, after these cells were incubated for 0 h with different concentrations of DDS-NHOH (0.0, 0.0 and 0,0 μg/mL). 