Explores the phenomenon of limb and organ regeneration in animals, highlighting species capable of restoring lost body parts with remarkable precision. It focuses primarily on the axolotl, a salamander renowned for its lifelong ability to regenerate limbs, organs, and even parts of its heart and spinal cord. The explanation details how this process begins with the creation of a blastema, a cluster of progenitor cells that proliferate and differentiate to rebuild the missing tissue. The text contrasts this near-perfect regeneration with the more limited capabilities of creatures like lizards, which can only regrow simplified, cartilage-based tails. It concludes by discussing why humans lack this ability, suggesting that the formation of scar tissue during healing likely prevents the kind of cellular reprogramming required for true regeneration.
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