Runyon classification system

Runyon classification system

[run′yən]
a system of identifying mycobacteria on the basis of pigmentation and growth condition of the organisms. It includes group I, yellow-pigment photochromogens; group II, yellow-to-orange-to-red pigment scotochromogens; group III, white-to-tan nonphotochromogens; and group IV, rapid-growing saprophytes.
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