Results polyadenylationsignal-deficient retroviruses could be packaged by PA317 packaging cells.
结果多聚腺苷酸化信号缺陷病毒可以在PA317病毒包装细胞形成病毒颗粒；
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Methods The polyadenylationsignal-deficient retrovirus vector mutated by PCR site-directed mutagenesis was used to make polyadenylationsignal-deficient retroviruses by PA317 packaging cells.