This ENU-induced mutation was isolated in a screen at the University of Pittsburgh. It is a subline of b2b370Clo. The molecular lesion for this subline is a G to T substitution at coding nucleotide 854 in exon 3 of the cDNA (c.854G>T, NM_010728). This changes the cysteine residue to phenylalanine at position 285 of the encoded protein (p.C285F).