CCDC13 and type 1 diabetes mellitus: Excluding seven mice homozygous for the recessive Srrm2 mutation, we analyzed the remaining 102 mice, among which were 12 mice homozygous for the Ccdc13 mutation, 51 heterozygotes and 39 WT; we observed association of homozygosity or heterozygosity for the Ccdc13 mutation with delayed T1D onset independent of Srrm2 genotype.