This ENU-induced mutation was isolated in a screen at the University of Pittsburgh. The molecular lesion is a T to A substitution at nucleotide +6 after coding nucleotide 1196 (c.1196+6T>A, NM_001039520) in intron 9. This may affect splicing from the nearby splice donor site. (J:175213) Additional incidental mutations were detected in sequencing for the causative mutation, Dnm2b2b2159Clo, and may be present in stocks carrying this mutation.