pho·​to·​chro·​mo·​gen ˌfōt-ō-ˈkrō-mə-jən How to pronounce photochromogen (audio)
: 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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Cite this Entry

“Photochromogen.” Medical Dictionary, Merriam-Webster, Accessed 18 May. 2024.

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