WITHDRAWN: Toxicity and SOS response to ELF magnetic field and nalidixic acid in E. coli cells

The Publisher regrets that this article is an accidental duplication of an article that has already been published in Mutat. Res.: Genet. Toxicol. Environ. Mutagen. 722 (2011) 56-61, http://dx.doi.org/10.1016/j.mrgentox.2011.03.012. The duplicate article has therefore been withdrawn.