GRK5 and type 2 diabetes mellitus: A subsequent study in another Chinese population found that the SNP rs10886471 in GRK5 can also act as a short tandem repeat (STR) polymorphism, with the intronic (CA)16 allele being associated with an increased, and all other (CA)15 to (CA)19 alleles with a decreased prediabetes and type 2 diabetes risk12.