a polymorphic region flanking the human insulin gene on the short arm of chromosome 11 , the insulin-gene-linked dna polymorphism , can be described as a locus with at least three classes of alleles : a common small `` '' class 1 '' '' allele averaging 570 base pairs , a rare intermediate `` '' class 2 '' '' allele of about 1320 base pairs , and a large `` '' class 3 '' '' allele averaging 2470 base pairs in size .
C0021641
insulin
C1337112
insulin-gene