Homozygous viable. Nonsense and splicing alleles identified by amplicon sequencing. The gk5190 mutation is G->A, flanking sequences CAAAAATCGAGATGAGTTAGTAAGCCGGAG and TGAGTTAATCATACAAAATCAAAAAAAAAA. The gk5191 mutation is A->C, flanking sequences CCAATCTATAGCATAGTATAAAAATATTTC and TATTCTTGAAAGAAGTTATAATATTGCAGA.