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Body weight of rats after intratracheal instillation of SWCNTs: the vehicle control (0.1% Triton X-100 per rat; vehicle control) and the SWCNTs in the low-dose (0.2 mg SWCNTs per rat; L-SWCNT) or high-dose (0.4 mg SWCNTs per rat; H-SWCNT) groups. Values are mean ± SD. *p < 0.05, **p < 0.01 (vs. each vehicle control group).
