This ENU-induced mutation was isolated in a screen at the University of Pittsburgh. It is a subline of b2b2362Clo. The molecular lesion for this subline is attributed to a G to T substitution at coding nucleotide postion 3538 in exon 31 of the cDNA (c.3538G>T, NM_011412). This changes the alanine residue to serine at position 1180 of the expressed protein (p.A1180S).