GFAP. Mean CSF concentrations of GFAP (Figure 1(d)) tended to be higher for MSA-C (0.71 ± 0.214 ng/mL) and SCA2 (0.68 ± 0.250 ng/mL) than controls (0.29 ± 0.045 ng/mL) but the effect of disease state on GFAP level did not reach overall statistical significance (X2 = 6.9, p = 0.143). This evidence concerns the gene GFAP and multiple system atrophy, cerebellar type.