然而，这一研究发现符合过去的研究结果，那就是在居无定所不断迁徙的人口中7R和一套统称为“长等位基因”的DRD4的类似变异体更加相同。
Nevertheless, this discovery fits past findings that 7R and a set of similar variants of DRD4, known collectively as "long alleles", are more common in migratory populations.
所以，有些人拥有两个短型等位基因，有些人拥有两个长型等位基因，剩下的则长型短型各一个。
So some have two short alleles, some have two long ones, and the rest have one of each.
结论：AGT基因235T等位基因、糖尿病病程长、既往高血压史均可增加2型糖尿病患者合并肾病的危险；
Conclusion:Allele T of AGT gene M235T, the longer diabetes duration and history of hypertension were associated with higher risk of nephropathy in type 2 diabetic patients.
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