Introduction . Advances in molecular biology have helped uncover the extrinsic environmental and intrinsic neuronal coordination required for axon regeneration1 , 2 , 3 , 4 , 5. Regeneration potential varies across types of neurons, including subtypes of retinal ganglion cells and dorsal root ganglion somatosensory cells6 , 7. Understanding the external and internal differences dictating regeneration specificity will help identify therapeutics capable of boosting th...