From "An ultra-sensitive on-off switch helps axolotls regrow limbs" https://news.ycombinator.com/item?id=36912925 :

> [ mTOR, Muller glia in Zebrafish, ]

From "Reactivating Dormant Cells in the Retina Brings New Hope for Vision Regeneration" (2023) https://neurosciencenews.com/vision-restoration-genetic-2318... :

> “What’s interesting is that these Müller cells are known to reactivate and regenerate retina in fish,” she said. “But in mammals, including humans, they don’t normally do so, not after injury or disease. And we don’t yet fully understand why.”