Axolotls are a type of salamander often studied for their extensive regenerative abilities. They can regrow tails, limbs, spinal cords, brains and more. This axolotl has been genetically modified so that its developing nervous system glows purple and its Schwann cell nuclei appear light blue to help illuminate the role of the peripheral nervous system during limb regeneration.
Image courtesy of Marko Pende, Hannover Medical School.