Analysis of polymerase chain reaction amplified products from the sixth intron of the human interleukin-1-alpha gene reveals a high polymorphism (polymorphism information content = 0.51) in a Caucasian population. Altogether, seven alleles have been defined ranging from 620 to 1220bp. This polymorphism is probably attributable to a variable number of 46-bp tandem repeats, each containing potential regulatory sequences.
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EASTGATE JA, 1991, BRIT J RHEUMATOL, V30, P295