Table 1 Effect of subchronic low-dose exposure to NP on the body weight gain from PND 21 to PND 55 in F1 male mice

	CON	NP-50
Initial body weight (g)	11.5±0.3	10.2±0.5*
Terminal body weight (g)	30.3±0.5	28.7±0.5*
Increasing body weight (%)	260±4	285±13

p<0.05, significantly different from the control group.