This ENU-induced mutation was isolated in a screen at the University of Pittsburgh. The molecular lesion is a C to T substitution at coding nucleotide 2845 in exon 23 of the cDNA (c.2845C>T, NM_172274). This changes the arginine residue to a translation stop at position 949 of the encoded protein (p.R949*). (J:175213) Additional incidental mutations were detected in sequencing for the causative mutation, Cc2d2ab2b1035Clo, and may be present in stocks carrying this mutation.