Transport of dehydroascorbic acid by human neutrophils and monocytes. (A) Uptake of dehydroascorbic acid (DHA) by human neutrophils in the presence of NaCl (○) or choline chloride (•). (B) Uptake of dehydroascorbic acid by human monocytes in the presence of NaCl (○) or choline chloride (•). (C) Uptake of ascorbic acid (AA) by human neutrophils in the presence of NaCl (○) or choline chloride (•). (D) Uptake of ascorbic acid by human monocytes in the presence of NaCl (○) or choline chloride (•). (E) Ratio of the uptake of dehydroascorbic acid versus ascorbic acid by human neutrophils in the presence of NaCl (○) or choline chloride (•). (F) Ratio of the uptake of dehydroascorbic acid versus ascorbic acid by human monocytes in the presence of NaCl (○) or choline chloride (•). Data represent the mean ± SD of four samples and correspond to one of three similar experiments.