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Severity of renal tubular hyperplasia in male rats (n = 30), following 2-year exposures to d-limonene, decalin, propylene glycol mono-t-butyl ether (PGMBE), and Stoddard solvent IIC (SS IIC). Additional dose in decalin treatment consisted of n = 15 male rats. Data are presented as mean ± S.E.; *significantly greater than controls, p ≤ 0.05. Numbers of animals with the lesion are presented in the box insert.
