Assertion: acetaldehyde | /r/HasProperty | five days per week
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Source sentences:
text: In male rats exposed to 500 ppm (900 mg/m3) acetaldehyde for six hours per day, five days per week, for four weeks, there were slight histopathological changes (i.e., loss of microvilli and disarrangement of the epithelium) in the olfactory epithelium and a reduction in the phagocytic index of lung macrophages.