3 positives of genetic engineering

Hi all, i am jsut wondering if someone could give me some insight on 3 positive uses of microbes for genetic engineering? thanks alot

I am writing a paper on it, and i can not seem to get started.

Thanks alot

Well, here is a good website I just found~ It has a whole section about positive aspects of genetic engeneering, (at the bottom of the page)

http://library.thinkquest.org/CR0215642/

Hope that helps! ^^