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The NTP inhibits the AFC response to SRBC. Five CON rats and five NTP-treated rats (with one-eighth [A] or one-fourth [B] section of a NTP) were immunized with SRBC and euthanized 4 days later. The anti-SRBC AFC response of spleen cells was determined as described in Materials and Methods. Values that were significantly different from the values for CON rats are indicated as follows: **, P ≤ 0.05; ***, P ≤ 0.001.
