Note: Colorimetric sensor array for analysis of volatile organic compounds (VOCs) in exhaled breath. In the system, 36 spots composed of different chemically sensitive compounds are impregnated on a disposable cartridge. The colors of the spots change based on the chemicals with which they come into contact.Reproduced from Mazzone P et al. Exhaled Breath Analysis with a Colorimetric Sensor Array for the Identification and Characterization of Lung Cancer. J Thorac Oncol 2012;7(1):137–142.