Dear Prof. ***,
I am working on ......(工作背景). And one of my projects focuses on........(工作内容)Isolating ROG cDNA seems to be a problem hard to get over for us（为什么要要）. One of my graduates has been working on it for a couple of months, but no progress（一定以导师和教授口气写，学生写人家可能不愿意给）. We are happy to find that your laboratory was the major source of the ROG cDNA in many publications. Therefore, I am writing to explore the possibility of getting ROG cDNA from your laboratory. If you were kindly offering us the DNA(pCI-ROG), it would be very helpful for us. Of course, the DNA will never be used for commercial purpose.We will acknowledge the DNA resource and cite your papers in all our publications based on the DNA. We are also willing to put you into the author list that’s necessary. Sure, We would like to sign any contract for the DNA transfer.
One of my graduates is waiting for the DNA to set up his experiment, so your early response will be greatly appreciated.