Medical Dictionary

photochromogen

noun pho·to·chro·mo·gen \ˌfōt-ō-ˈkrō-mə-jən\

Medical Definition of PHOTOCHROMOGEN

:  a microorganism especially of the genus Mycobacterium (as M. kansasii) that has little or no pigment when grown in the dark but becomes highly pigmented when grown in light
April 27, 2015
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