In KEGG, diseases are viewed as perturbed states of the biological system caused by perturbants of genetic factors and environmental factors, and drugs are viewed as different types of perturbants.
En KEGG, as doenzas son consideradas como estados perturbados do sistema biolóxico causados por perturbantes de factores xenéticos e ambientais, e os fármacos considéranse como diferentes tipos de perturbantes.