алтны хүдрийн жижиг өнхрөх бутлуур
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 sequence..