(B) Representative PCR genotyping results from 2 Fus+/+, 2 FusΔNLS/+ and 2 FusΔNLS/ΔNLS knock-in mice using primers designed around the distal loxP site of the FusΔNLS allele and shown as gDNA in panel A. The expected size of the PCR product of the ∆NLS allele is 240 bp; the size of wild type allele is 160 bp. 