For years scientists have been perplexed at how lizards regrow their tails, a great defense mechanism that could have huge implications for human amputees. Researchers at Arizona State University have uncovered the “genetic recipe” that lizards “turn on” to regrow their tails. Scientists found that lizards enable at least 326 genes in specific regions to regrow their tail, in parts of their body ranging from wound healing areas, to embryonic development parts. Though there is still a lot of bioengineering to be done before humans can regrow arms and legs, the finding is one of the biggest yet for biogenetic regeneration.