[求助]要基因的英文信怎么写？

向国外实验室要自己所需要的基因，应该怎么写英文信才好？

有几种写法：
1。直接要。
2。对方可以署名
3。合作

具体怎么写啊?

I am very interested in your article published in ** which is an excellent work.Now I am doing some experiments about the ** according to your methods of the paper.
But I meet some difficulties and cannot find ways to resovle them.

**

Would you like to send me the plasmid of **?

Your kind help will be very appreciated.