IL4I1 and fungal infectious disease: Furthermore, the down-regulation in the expression of L-amino acid oxidase, a flavoprotein that catalyzes the oxidative deamination of the L-amino acid α-amino group resulting in subsequent release of H2O2 and ammonia (Nuutinen and Timonen, 2008), suggests a perturbation in the fungal infection progress, since release of ammonia and H2O2 serves to propagate fungal spread.