Fig. 1From: Red Spectral Shift in Sensitive Colorimetric Detection of Tuberculosis by ESAT-6 Antigen-Antibody Complex: a New Strategy with Gold NanoparticleSchematic representation for ESAT-6 detection by a single-step pre-complexed antibody-based colorimetric assay. a Strategy for anti-ESAT-6 antibody pre-complexed ESAT-6. b Strategy for anti-ESAT-6 antibody pre-complexed CFP-10 (control experiment)Back to article page