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The BamHI polymorphic site is located within exon VI, which codes for the 3' untranslated region. The two BamHI alleles differ by a single point mutation at the restriction site. The RsaI and TaqI polymorphic sites are located within intron V. The two alleles differ at the restriction site, either by a point mutation (RsaI) or by a 4-bp deletion (TaqI).

Murray et al. (1986) and Hayward et al. (1987) have demonstrated RFLP for the human TGFa locus, with the restriction endonucleases BamHI (two alleles, 7.0 kbp and 4 kbp), RsaI (two alleles, 1.5 kbp and 1.2 kbp),and TaqI (two alleles, 3.0 kbp and 2.7 kbp).
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