The Cblb mutation, one of the causative gene in type 1 diabetes of KDP/Tky and KDP alleles in other modifier genes were transferred onto the genetic background of TM:Kyo strain.
Cblb homozygous rats show mild to severe insulitis. The incidence of Type 1 diabetes is 20 to 50% (The onset of Type 1 diabetes is later and the incidence is lower than those of KDP rat strain