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Effect of air humidity on dried blood spot assay results. Concentrations of asymmetric dimethylarginine (ADMA) (a) and L-arginine (b) in untreated dried blood spots subjected to low (40–60%) or high air humidity (95%), as compared to dried blood spots pre-treated with the arginase inhibitor, nor-NOHA, at high air humidity. Data are presented as mean ± SD; * p < 0.05 between groups.
