A spontaneous G-to-A point mutation at 92,250,964 of Chr15 (GRCm38) changes tryptophan codon 364 into a premature stop codon at position 364 (p.W364*). Western blot of brain or spinal cord extracts from homozygotes failed to identify this protein and efforts to amplify segments of this gene from cDNA failed. (J:178817, J:222308)