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Baygon was administered IG once daily to CD rats (5 to 50 mg/kg), on the 7th-19th day of gestation or to CD-1 mice (5 to 60 mg/kg) on days 6-16 of gestation. Baygon, at dose levels which were not maternally lethal, did not produce fetotoxicity, fetal lethality or malformations in the fetuses. Baygon was not teratogenic in the CD rat or CD-1 mouse at maternally nontoxic dose levels. Carbofuran was administered IG once daily to CD rats (0.05 to 5.0 mg/kg), on the 7th-19th day of gestation or to CD-1 mice (0.1 to 20 mg/kg) on days 6-16 of gestation. At dose levels which were not maternally lethal, carbofuran did not produce fetotoxicity, fetal lethality or malformations in the fetuses. Carbofuran was not teratogenic in the CD rat or CD-1 mouse at maternally nontoxic dose levels. Dimethoate was administered IG once daily to CD-1 mice (10 to 80 mg/kg), on the 6th-16th day of gestation. At dose levels which were not maternally lethal, dimethoate did not produce fetotoxicity, fetal lethality or malformations in the fetuses. Dimethoate was not teratogenic in the CD-1 mouse at maternally nontoxic dose levels. EPN was administered IG once daily to CD-1 mice (1.0 to 12.0 mg/kg) on the 6th-16th day of gestation. EPN, at dose levels up to those which were maternally lethal, did not produce fetotoxicity, fetal lethality or an increase in malformations. EPN was not teratogenic in the CD-1 mouse at maternally nontoxic dose levels.