the reason they dont have any thing like this for humans is for ethical reasons ( u can just guess at what arguements lay there) and also because the person will live like that for the rest of the lives and there is no possible way to change it back. But DNA is used to make insulin. Insulin used to come from horse blood and caused complications etc. due to the antibodies fighting off the foreign horse insulin.Now human insulin is produced in transgenic bacteria that have had the human gene that produces insulin inserted in them, therefore human insulin is now readily available.

Sorry so long but for ppl having problems with getting the fish to glow try buying a black light.