Molecular mechanisms underlying regeneration
4.   Increase (good) microglia in eye by stabbing lens*
*or by a macrophage activator
lens
Macrophages activated;
  retinal axons regenerate
Rat eye
Macrophage-derived proteins < 30 kD are growth-
    promoting
Yin…and Benowitz, 2003, J. Neurosci. 15: 2284