Fig. 4From: A sensitive chemiluminescence based immunoassay for the detection of cortisol and cortisone as stress biomarkersImages of CL signal related to ferrocene tagged antibody, (a) characterise the ferrocene tagged antibody before ferrocene oxidation, (b) immediately after the oxidation, (c) 1-day oxidation (d) after 1-week oxidation. The scale bar is 0.5 cm.Back to article page