In 1976, the human leukocyte antigens (HLA) test was introduced. Mutation rates in this polymorphous protein are quite high, allowing its accuracy to reach roughly 90 %.
1976 年，醫界引進「人類白血抗原」（HLA）的檢查，此一多型性蛋白質的變異性相當高，鑑別度可提高到九成左右。