Sample collection and DNA extraction

YG Yan-Ling Guo
YL Yang Liu
WB Wu-Juan Ban
QS Qi Sun
GS Guang-Li Shi
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Peripheral blood, 4 ml, was obtained from each patient and control. Samples were centrifuged for 10 min at 3000 g to separate serum. Ethylene diamine tetraacetic acid (EDTA) anticoagulant tubes were used to collect another 2 ml venous blood samples from each participant. A blood DNA isolation kit was used to extract the peripheral white blood cell genome (MBI, USA). The subsequent DNA extraction procedures were performed according to the manufacturer instructions and DNA were stored in a refrigerator at -20 °C.

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