An injury-induced serotonergic neuron subpopulation contributes to axon regrowth and function restoration after spinal cord injury in zebrafish

The mechanisms involved in regeneration of the spinal cord after injury are unclear. Here, the authors show that a subpopulation of intraspinal serotonergic neurons localized at the injury site stimulates axonal regrowth of interneurons via 5-HT1B receptor, resulting in recovery of function following SCI in zebrafish.