title: Reply to the letter to the editor regarding our article (Bailey et al., 2009).
authors.affiliation: Department of Environmental and Molecular Toxicology, Oregon State University , Corvallis, Oregon 97331, United States.
authors.forename: George S
authors.initials: GS
authors.lastname: Bailey
authors.forename: Clifford B
authors.initials: CB
authors.lastname: Pereira
mesh_terms: D000818:Animals; D014408:Biomarkers, Tumor / Q000378:metabolism*; D006801:Humans; D009374:Neoplasms, Experimental / Q000139:chemically induced*
chemical_list: D014408:Biomarkers, Tumor