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Comparative histopathological appearance of the lungs of uninfected control BALB/c mice treated with PBS-NMS (a) (HPS = 0) or intranasal IL-12 (b) (HPS = 1) and of M. pneumoniae-infected BALB/c mice treated with PBS-NMS (c) (HPS = 6) or intranasal IL-12 (d) (HPS = 15) on day 6 of treatment. Magnification, ×20.
