Whole ORF2 genes of 173 positive clinical PCV2 samples from Beijing and other areas were amplified by PCR and followed by restriction fragment length polymorphism (RFLP) analysis.
采用聚合酶链式反应（PCR）技术对来自北京等地区的173份PCV2阳性样本的全长ORF2基因进行了扩增，并对扩增产物进行了限制性片段长度多态性（RFLP）分析。
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