<Dl> <Dt> Photochromogens (Group I) </Dt> <Dd> Produce nonpigmented colonies when grown in the dark and pigmented colonies only after exposure to light and reincubation . <Ul> <Li> Ex: M. kansasii, M. marinum, M. simiae . </Li> </Ul> </Dd> </Dl> <Dt> Photochromogens (Group I) </Dt> <Dd> Produce nonpigmented colonies when grown in the dark and pigmented colonies only after exposure to light and reincubation . <Ul> <Li> Ex: M. kansasii, M. marinum, M. simiae . </Li> </Ul> </Dd> <Ul> <Li> Ex: M. kansasii, M. marinum, M. simiae . </Li> </Ul>

Why are mycobacterium given their own classification in the bergey's manual