Fig. 6. (a and b) FL and (c and d) CL images and calibration curves for the detection of 4 protein biomarkers. Protein concentrations from C1 to C5 are 0.033, 0.33, 3.3, 33 and 330 ng mL^–1 for AFP, 0.017, 0.17, 1.7, 17 and 170 U mL^–1 for CA 125 and CA 199, and 0.067, 0.67, 6.7, 67 and 670 ng mL^–1 for CEA.