Methods40 healthy Kunming mice were selected and randoml y divided into 4 groups,10 mice per group,FA low-dose group(2.5? mg/m 3 ),FA mid dle-dose group(5?mg/m 3),FA high-dose group(10?mg/m 3),experimental control group(exposed no FA).

• 方法 选择健康昆明小鼠 40只 ,随机分为 4组 :甲醛低剂量组 (2 5mg/m3)、中剂量组 (5mg/m3)、高剂量组 (10mg/m3)、对照组 (无甲醛暴露 ) ,每组 10只。