that's being used has already gone through the RNA splicing mechanism

已经经过了RNA剪接机制的剪接
and so the introns have already been removed.

切去了内含子
If I could isolate that messenger RNA -

如果我可以分离出mRNA--
messenger RNA is just

mRNA仅是
a copy of the DNA from which it came -

来自于相应DNA的复制品
so if I could do the process of reverse transcription,

所以如果我可以对它进行逆转录
that is instead of transcription

也就是说不是从
which goes from DNA to RNA,

DNA到RNA的转录过程
if I could go backwards from RNA to DNA,

我可以倒过来从RNA到DNA
I could recover a DNA version of the gene

我就能恢复出我感兴趣的
that I'm interested in.

基因的DNA版本
It turns out that we can do that now

我们现在已经可以做到这一点了