ScienceDaily (Oct. 9, 2012) — Just because a lizard can grow back its tail, doesn't mean it will be exactly the same. A multidisciplinary team of scientists from Arizona State University and the University of Arizona examined the anatomical and microscopic make-up of regenerated lizard tails and discovered that the new tails are quite different from the original ones.
http://www.sciencedaily.com/releases/2012/10/121009092416.htm