The localization of AFP in certain cells in early stages during hepatocarcinogenesis in rats fed 2-AAF was revealed using indirect immunofluorescent technique. AFP containing cells appeared only around the portal triads in the 5th week after the commencement of a 2-AAF diet. With the lapse of time, AFP containing cells, which were shown to be hyperbasophilic hepatocytes by H & E stain, formed foci to nodules.
                                 
                                
                                        α-fetoprotein (AEP)
                                        hyperplastic nodule
                                        oval cell
                                        2-acetylaminofluorene  (2AAF)