Figure 10. the effect of exposure time on the progesterone (A)/estradiol (B) in the mice at GD 18 days post injection with oMWCNTs.

(A–B),*p < 0.05 compared with the control groups; ^&p < 0.05, compared with the HD-S. LD-F is exposure group with low dosage (4 mg/kg.bw/per day) five times for 5 days. HD-S is exposure group with heavy dosage (20 mg/kg.bw) for 1 day (n = 5, all data represent means + s.e.m, all data were statistical analysis by ANOVA).