Figure 6: DPV response studies of Ab/GO/ITO immunoelectrode in 0.05 mM K3Fe(CN)6 contained in 5 mM PBS, pH 7.4 at pulse amplitude 0.03 V and pulse width 0.05 s for various hTERT concentration (100 fg mL-1-10 ng mL-1) spiked in sputum ; (B) Calibration of the immunosensor for hTERT determination in spiked sputum.