But it's hard to tell in most natural populations whether inheritance is due to DNA sequence variation or epigenetic changes.
但在自然界大多数种群中，很难判断遗传是否源于DNA序列改变或者表观基因变异。
Objective To study sequence variation of V3 loop of HIV-1 strains prevalent in China.
目的研究中国艾滋病病毒1型（HIV-1）毒株V3环序列的变异性。
Sequence variation was screened by means of PCR single stranded conformation polymorphism (SSCP) and DNA sequencing.
用PCR -单链构象多态性(SSCP)和DNA序列分析方法确定扩增序列突变情况。
Sequence variation was screened by means of PCR single stranded conformation polymorphism (SSCP) and DNA sequencing.
用PCR -单链构象多态性(SSCP)和DNA序列分析方法确定扩增序列突变情况。
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