We construct a marker-free vector of RB gene in order to apply with RB in the tomato late blight breeding and production.
为了使马铃薯抗晚疫病基因RB能够在番茄育种和生产中应用，构建了RB无选择标记载体。
Objectives: To establish the technology for extracting cell-free fetal DNA in maternal plasma, comparing detection rate of fetal component marker SRY gene and RASSF1A gene.
工作目的：建立母血浆中胎儿游离dna分离提取的技术，利用SRY基因和RASSF1A基因检测胎儿游离dna，并比较它们的检出率。
Objectives: To establish the technology for extracting cell-free fetal DNA in maternal plasma, comparing detection rate of fetal component marker SRY gene and RASSF1A gene.
工作目的：建立母血浆中胎儿游离dna分离提取的技术，利用SRY基因和RASSF1A基因检测胎儿游离dna，并比较它们的检出率。
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