Experiment I: gene expression profiling of distinct astrocytic subpopulations.

<p><b>A:</b> Bar plot with SEM for all the expressed genes; significant differences are indicated with asterisks (<i>p</i><0.05 (*), <i>p</i><0.01 (**), <i>p</i><0.001 (***). <b>B:</b> Principal component analysis. The identification of 2 astrocytic subpopulations is along the first principal component, which accounts for most of the variation in the measured data. <b>C:</b> Clustering of astrocytes using Kohonen SOMs. The expression levels of all genes were mean-centered. Each dot represents one cell. <b>D:</b> Dendrogram based on all astrocytic genes. The y-axis shows the distance between groups.