Comparison of microglial numbers in wildtype (251F20, n=11; 81F7, n=5), TNF-KO (219F15, n=14; 85F5, n=7), and TNF-p55p75R-KO (221F11, n=13; 95F3, n=4) mice pointed towards a reduced lesion-induced increase in microglial number in TNF-and TNF-R-KO mice, which, however, was not statistically significant ( P=0.16, two-way ANOVA).