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

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