Runyon group III mycobacteria

Runyon group III my·co·bac·te·ri·a

mycobacteria that are either colorless or that slowly produce a light yellow pigment when grown in the presence of light. Organisms placed in this group include Mycobacterium avium and M. intracellulare.
Synonym(s): nonchromogens

Run·yon group III my·co·bac·te·ri·a

(rŭn'yŏn grūp mī'kō-bak-tēr'ē-ă)
Mycobacteria that grow slowly and do not produce pigment. Organisms placed in this group include Mycobacterium avium and M. intracellulare.