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Determination of the plaque forming cell (PFC) response to sheep red blood cells (SRBC) following 4 days in culture of spleens cells obtained from mice receiving 14 day inhalation exposure (3 hrs per day) to air (control) , 50 μg/m3 ATO, or 1 mg/m3 ATO. Results shown are the average number of PFC + SEM obtained for triplicate cultures of 7 individual mice per group. Significant suppression (p < .05) of the PFC response was seen at both the 50 μg/m3 and 1 mg/m3 levels of exposure.
