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The c1 (B6NLxv1c2) line was derived from Hepa-1c1c7 (ATCC CRL-2026). Hepa-1c1c7 has high CYP1A1-dependent aryl hydrocarbon hydroxylase (AHH) activity. N-methyl-N-nitro-N-nitrosoguanidine (MNNS) mutated colonies were selected for benzo[a]pyrene resistance. The c1 (B6NLxv1c2) cell line lacks cytochrome P4501A1 dependent aryl hydrocarbon hydroylase (AHH) activity due to a single point mutation in CYP1A1 leading to premature termination of the translated protein (Asn-414; 56 kDa to 45 kDa). The line may be used to study xenobiotic (and carcinogenic) metabolism in the absence of cytochrome P4501A1 activity, which is known to metabolize cytotoxic and carcinogenic intermediates. It is also a tool to study the putative natural ligand for the induction of this enzyme.