谁帮我断断这个句?

If a cell degrades both a rapidly and a slowly synthesized mRNA slowly, both mRNA’s will accumulate to high levels.

来看新东方内部阅读理解资料P127.

谢谢!

是否能给出上下文参考。。句子结构是

if a cell degrades xxx, mRNA'synthesize will xxx

If a cell degrades
            both a rapidly and a slowly synthesized mRNA slowly, both mRNA’s
            will accumulate to high levels.