From The Conversation · Junsu Kang · · 1m
Why Can't People Regenerate Limbs Like Salamanders?
Salamanders regrow limbs but humans cannot. Scientists study how to unlock human regeneration.
In brief
Salamanders regrow limbs but humans cannot. Scientists study how to unlock human regeneration. Salamanders and zebrafish can regenerate limbs while humans cannot due to cellular and nerve signaling differences. Originally reported by The Conversation.
Salamanders Regrow Limbs
Salamanders like axolotls can regrow lost limbs with bones, nerves, blood vessels and muscles.
Zebrafish Regenerate Fins
Zebrafish can regenerate injured fins and repair damaged parts of their heart and brain.
How Regeneration Works
Regenerating animals form a blastema after injury to rebuild missing tissue with the right shape and size.
Nerves Control Regeneration
Nerves send signals to form a blastema; without enough nerve signals, regrowth can stop.
Human Regeneration Limits
Humans have limited regeneration: skin, blood cells and liver can renew but not limbs.
Regeneration Trade-Offs
Male zebrafish have structures that inhibit fin regeneration, showing evolutionary trade-offs.
Scientists Study Regeneration
Researchers explore nerve signaling and genes to unlock human regeneration.
The short version
Salamanders and zebrafish can regenerate limbs while humans cannot due to cellular and nerve signaling differences.
