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Inhibitor titrations: Human MAO-A and MAO-B were incubated with various concentrations of clorgyline or pargyline respectively. Each concentration of inhibitor contained 10 v/v% DMSO (final 0.5 v/v%). The IC50 for Clorgyline with 3 U/mL human MAO-A was determined to be 11 nM; while the IC50 for pargyline with 6 U/mL human MAO-B was determined to be 404 nM.