Studies showing that Arabidopsis GSNOR activity is suppressed by secreted proteins from P. parasitica,[54] and that the amount of tomato protein S‐nitrosothiols is increased after infection by P. infestans and P. capsici,[56] already suggested that pathogens are able to modulate host S‐nitrosylation levels to facilitate colonization. The gene discussed is PROS1; the disease is infection.