Objective To study the effect of modified improved primer extension preamplification (IPEP) on STR analysis of trace DNA.

目的探讨改良扩增前引物延伸(ipep)法对痕量DNA样本s TR检测分型的效果。

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Objective To study the influence of different DNA extraction methods combined different PCR cycle Numbers on STR analysis from trace bloodstain on various carrier often seen in forensic area.

目的探讨常见载体上的微量血痕dna的提取方法、P CR循环次数对STR扩增成功率的影响。

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