A nanocomposite electrode made of MWCNTs and AuNPs was prepared to detect DJ‐1 protein as an important biomarker of Parkinson ́s disease and oxidative stress.[111] Antibodies specific to DJ‐1 were immobilized on the surface of MWCNTs (Figure 4B), and the composite interface MWCNTs‐AuNPs ensure high charge transfer characteristics. The gene discussed is PARK7; the disease is Parkinson disease.