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. 2021 Jun 2;387(3):319–336. doi: 10.1007/s00441-021-03477-w

Fig. 3.

Fig. 3

Mammalian neurons lose regeneration potential with age. Embryonic and immature mammalian neurons have a higher potential for axon regeneration after injury due to increased pro-regenerative intrinsic factors and decreased regeneration-inhibitory extrinsic factors compared to the adult mammalian neuron. Immature neurons additionally possess pro-regenerative molecular signals/transcriptome, which is turned off as the neurons age into adulthood