Why frogs can't regenerate lost limbs like axolotls

In Lake Xochimilco of central Mexico dwells a rare salamander, the axolotl (Ambystoma mexicanum). In the wild, the axolotls do not metamorphose: adults very much resemble their larval counterparts and keep the external gills ...

Discovery of an elusive cell type in fish sensory organs

One of the evolutionary disadvantages for mammals, relative to other vertebrates like fish and chickens, is the inability to regenerate sensory hair cells. The inner hair cells in our ears are responsible for transforming ...

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