Since brain tumors are uncommon in the F344 rat and B6C3F1 mouse plus the fact that the control rates are very con- stant, even a small chemically associated increase in brain tumors may be quite significant.
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Since brain tumors are uncommon in the F344 rat and B6C3F1 mouse plus the fact that the control rates are very con- stant, even a small chemically associated increase in brain tumors may be quite significant.