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Concentrations of germ cells in mice exposed to B[a]P from 1 to 100 mg/kg/day for 30 days. SG: spermatogonia, PS: pachytene spermatocytes; ES: elongated spermatids. Germ cell values represent concentration as cells/mL. All values are means ± SD. Significance expressed as *P < 0.05, **P < 0.01.
