This ENU-induced mutation was isolated in a screen at the University of Pittsburgh. It is a subline of b2b2966Clo. The molecular lesion for this subline is attributed to a C to G substitution at coding nucleotide 447 in exon 3 of the cDNA (c.447C>G, NM_001081020). This changes the serine residue to arginine at position 149 of the encoded protein (p.S149R).