This allele contains a duplication of exons 14 and 15 followed by insertion of a neo cassette, loxP site, and 5' Hprt minigene. It was produced in cis with an insertion of a 3' Hprt mini gene, loxP site, and puro cassette between Cbs and Uaf1 (Is(17B1)1Yah) 0.59 Mb away. (J:154298)