APEX1 and infection: In these publications, increased activity following inoculation was shown for the enzymes peroxidase (POX), phenylalanine ammonia lyase (PAL), β-1, 3-glucanase (GLU) and chitinase (CHI), superoxide dismutase (SOD), ascorbate peroxidase (APX), with elevated H2O2 production after infection and pathogen advance also shown (Table 4).