This allele is a derivative of Nf1tm1Par. Exons 31 and 32 were deleted via Cre mediated recombination. This was achieved by mating mice carrying the NF1tm1Par mutation to mice carrying Egr2tm2(Cre)Pch (strain 129S2/SvPas). This deletion is heritable, and is transmitted through the germ line. (J:68558)