I say use frog DNA!
Seriously, why not just clone the mammoth like it was a common sheep (hello Dolly!) and use elephants to bring the zygote to term. then you have a 100% mammouth.
I would love to see some fast breeding super velociraptors introduced upon the public, say Iran for instance.
It just warms my heart visioning images of raptors vs. Hezbolla
Or Aliens and Predator as well. I hope the scientist do bring back the mammoth, and also some dodo birds.