Алтны үйл явцын бутлуур цагаан алтны уурхайн үйл явц гэж юу вэ Монгол The polymerase chain reaction PCR is a biochemical technology in molecular biology to amplify a single or a few copies of a piece of DNA across several orders of magnitude generating thousands to millions of copies of a particular DNA . өмнөд африк дахь ...
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