A scavenging immune system cell that helps limbs regrow in salamanders brings hope that humans will one day be able to mimic the animal's amazing regenerative powers, say Australian researchers. The findings by Dr James Godwin, of the Australian Regenerative Medicine Institute at Monash University, and colleagues, are published in today's issue of the Proceedings of the National Academy of Sciences.Salamanders (axolotls) are unique amongst vertebrates in being able to repair their hearts, tails, spinal cord and brain, and even regrow whole limbs during adult life, says Godwin. He sees their "perfect regeneration" as a holy grail. "We're trying to...