???????????????
????DNA??????????????????DNA?????????????????????PCR???????????????????????????????????PCR???????????????????Si?Pb?V?Zn?Cu?Cd?Ca?Bi?Tl?Sn?Hg?Se?As?13??????????????PCR?????????????????1ppb?10ppm???????????????PCR???????????????????PCR???????????????????????????????1ppm??10ppm??????????????????????? 10 ppm ?? 1 ppm ????????PPY23 ??????????????????????????? PCR ???????? 4 ???? (?? 32 ???????) ??????????????????
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