Results polyadenylation signal-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；
2
The ability to make mRNAs of varying sizes from one coding region, by altering the site of pre-mRNA cleavage and polyadenylation.
通过改变前体mrna的切割位点和聚腺苷酸化位点而从一个编码区产生不同大小mrna的能力。
3
The underlined nucleotides are the first upstream in-frame stop codon and the two putative polyadenylation signals, respectively. The asterisk indicates the stop codon.