Neutrophil NADPH-oxidase activity triggered by PGL from M. tuberculosis and M. kansasii, respectively. The time-courses of the neutrophil responses induced by (a) M. tuberculosis PGL or (b) M. kansasii PGL are given. The responses were measured with luminol and HRP in microtitre wells coated with PGL at coating concentrations of 0.1 μg/ml (•), 10 μg/ml (□), or 30 μg/ml (▪). Abscissa, time (min); ordinata, chemiluminescence (arbitrary units).