This allele is a derivative of Mbtps1tm1Jdh. Mice carrying the Mbtps1tm1Jdh allele were mated to mice carrying a transgene expressing Cre recombinase in the male germline. Progeny of this cross were screened for deletion of exon 2, the neomycin selection cassette and flanking intronic sequences in all tissues. (J:72930)