Fig. 4. KAT I, KAT II and KAT III activity in samples of female and male human saliva. Fourteen female saliva samples were used and 10 male samples. Data represent the mean ± SEM. No significant differences were found according to sex: KAT I, p = 0.07754; KAT II, p = 0.06881; and KAT III, p = 0.07537 (Student's t-test).