Localization of an IFN-α/β–responsive element within the Ly-6E minimal promoter. Comparison of CAT activities from representative stable clones derived from transfection of A20-2J cells with constructs containing fragments of Ly-6E promoter linked to CAT reporter gene. Plasmids pCAT-4 and pCAT-2 contain sequences up to −420 and −167, respectively. Plasmids pCAT-8 and pCAT-1 contain sequences up to −113 and −81, respectively. Tri-TK-CAT has a triple repeat of the sequence between −113 and −88.