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Low dose benzo(a)pyrene up-regulated the transcription of HSP70 and HSP90 in Eisenia fetida. 
ZHENG Sen-lin1,2,3; SUN Tie-heng1; XIAO Hong1; QIU Xiao-yan4; SONG Yu-fang1
Chinese Journal of Applied Ecology . 2008, (02): 401 -406 .