Ninety-six multiplex type I diabetic families were typed at the 5' flanking region of the insulin gene by using a PCR assay that better resolves the VNTR into multiple alleles. Affected sibling pairs shared 2, 1, and 0 VNTR alleles--identical by descent--at a frequency of .47, .45, and .08, respectively, a ratio that deviated from the expected 1:2:1 ratio (P < .001). These results confirm linkage of the chromosome 11p15.5 region with type I diabetes mellitus susceptibility.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1918272PMC

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