MAOB and asthma: As shown in Figure 1, platelet 5-HT concentrations were significantly lower (p = 0.0008, U = 5388.0, Mann-Whitney test) in asthma patients (0.81 nmol/mg of protein, 0.62–1.09) when compared to healthy subjects (0.97 nmol/mg of protein, 0.72–1.65), while platelet MAO-B activity was significantly higher (p < 0.0001, U = 5056.0, Mann-Whitney test) in asthma patients (43.05 nmol/mg of protein/h, 34.39–58.21) in comparison to the control group (33.32 nmol/mg of protein/h, 25.71–51.26).