这个转基因插入包含4.4千碱基的突变型Dhfr和一个SV40启动子。大约有400个拷贝的转基因在单一位置插入。 (Source: This information is provided in the original text)
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This transgene insertion contained 4.4 kb of a mutant form of Dhfr and an SV40 promoter. Approximately 400 copies of the transgene inserted at a single site.