# Why Can't People Regenerate Limbs Like Salamanders?

> Salamanders regrow limbs but humans cannot. Scientists study how to unlock human regeneration.
- Title: Why Can't People Regenerate Limbs Like Salamanders? | Shortify
- Summary: Salamanders regrow limbs but humans cannot. Scientists study how to unlock human regeneration. Salamanders and zebrafish can regenerate limbs while humans…
- Keywords: salamanders, zebrafish, limb regeneration, cell differentiation, nerve signaling, regeneration trade-offs, curious kids, science, ideas, Can't, People, Regenerate
- Source: The Conversation — https://theconversation.com/why-cant-people-regenerate-limbs-like-salamanders-292088
- Author: Junsu Kang
- Read time: 1 min
- Topics: salamanders, zebrafish, limb regeneration, cell differentiation, nerve signaling, regeneration trade-offs, curious kids, science, ideas
## 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.
## Key takeaway

Salamanders and zebrafish can regenerate limbs while humans cannot due to cellular and nerve signaling differences.