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用人外周血淋巴细胞的非程序ＤＮＡ合成（ｕｎｓｃｈｅｄｕｌｅｄＤＮＡｓｙｎｔｈｅｓｉｓ，ＵＤＳ）对镍、铅、汞化合物进行了测试，结果表明，这三种重金属都具有诱发ＵＤＳ的活性，并提示，受试重金属化合物达到一定浓度后，ＵＤＳ的ｃｐｍ值不再随剂量增高而增高，似乎在一定实验条件下ＵＤＳ的修复合成能力有一定限度。
Nickel, lead and mercury compounds were tested by nonprogrammed DNA synthesis (UDS) of human peripheral blood lymphocytes. The results showed that all three heavy metals had the activity of inducing UDS and suggested that the tested heavy metal compounds reached a certain concentration After the UDS cpm value no longer increased with the dose increased, it seems that under certain experimental conditions UDS repair synthesis has a certain limit.