GSTM1 and type 1 diabetes mellitus: Hovnik et al. [58] investigated the 116Val/Ala SOD, the -262C/T CAT gene polymorphisms, glutathione-S-transferases GSTM1 and GSTT1 polymorphic deletions as well as number of pentanucleotide (CCTTT)n repeats in inducible nitric oxide synthase in patients group with type 1 diabetes.