This congenic strain was established by backcrossing ACI.F344-(D16Nkg9-D16Nkg27)Nkg onto ACI/NJcl, followed by intercrossing in N3 generation, thereafter maintained by crossing homozygous individuals.
F344 rats are susceptible and ACI rats are resistant to PhIP (2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine)-induced ACF (aberrant crypt foci) formation