Austraillian Scientists have done the Umbrella Inc. thing and have created "zombie mice" or mice which can regenerate any organ except the brain. The organs can even withstand damage and COMPLETE REMOVAL and still regenrate.
Another thing that follows suit of Shaun Of The Dead is the fact that when fetal liver cells were injected into ordinary mice, they inherited the regeneration trait. OMG THEY CAN INFECT OTHERS!
TEH ZOMBIE RATS WILL TAKE OVER!
I got more stuff on my site xncstudios.tripod.com, mostly where I got it from and Rasident Evil/Shaun Of The Dead references
But I think this is really interesting. Imagine being able to cure cancer by removing the infected organ.