- Laser photocoagulation alters the pattern of staining for neurotrophin-4, GFAP, and CD68 in human retina. Ghazi-Nouri, S.M., Assi, A., Limb, G.A., Scott, R.A., von Bussmann, K., Humphrey, I., Luthert, P.J., Charteris, D.G. The British journal of ophthalmology. (2003)