Homozygous viable. Nonsense and splicing alleles identified by amplicon sequencing. The gk5186 mutation is C->T, flanking sequences TCCGAGATATAGCAGAATTATGATCCAGGA and CAATTTTTTTGATTTAAAATCCATTTTTTG. The gk5187 mutation is G->A, flanking sequences AGATATGAGCGAAGATAAAGTTCTTATTAG and TAAGTAGCTTATTTTTTTAGAAAAAAACAT. The gk5188 mutation is C->T, flanking sequences GAAATCGCCAACATCAACCATTCAGTTAAA and AGCTTCTAACTGATATGGATACGGTGAAAG.