KS was expressed in a subpopulation of microglia.

<p>(A-I) The SOD1^G93A mice lumbar spinal cords at 18 weeks were stained by anti-KS (B, E, H), anti-Iba1 (microglia marker; A–C), anti-GFAP (astrocyte marker; D–F), and anti-NG2 (oligodendrocyte precursor marker; G–I) antibodies. Merged images are shown in C, F and I. Bars, 50 µm. Arrows, KS⁺Iba1⁺ cells; arrowheads, KS^-Iba1⁺ cells. (J) A representative profile of KS expression in CD11b⁺ cells. The red line indicates a negative control that does not contain the primary antibody, and the blue line indicates a stained sample. (K) The quantitative data of mean fluorescence intensity (MFI) of KS (n = 3). Error bars, SE. **p<0.01. N.S., not significant. (L) The biosynthesis of KS. (M) mRNA expression of the enzymes involved in KS biosynthesis was examined by quantitative RT-PCR using SOD1^G93A (gray columns) and their age-matched non-Tg (white columns) mice at 24 weeks. GAPDH was used as the internal control. Error bars, SE. ** p<0.01, * p<0.05 (n = 4). N.S., not significant.