Percentage of astrocytes ( g ; S100 + and SOX9 + ) and neurons ( h ; NeuN + ) expressing -crystallin ( n = 4, 8 and 7 mice for SOX9, S100 and NeuN, respectively). The white arrows in panels d and f point to instances of co-localization in the images. Average data shown as mean s.e.m. and all statistics reported in Supplementary Table 5 .