🦎 NEW: #Salamanders and #zebrafish regrow lost limbs and fins by reactivating a cellular program after injury, forming a blastema of cells that multiply and rebuild bone, nerve, muscle and blood vessels in the right shape and size. #Nerves drive the process, and #evolution appears to trade #regeneration away in some cases for specialized traits.
👉 https://theconversation.com/why-cant-people-regenerate-limbs-like-salamanders-292088
#biology #stemcells #science #evolution #anatomy #medicine #research #animals #wildlife #nature