Comparisons of cell types.

(A) Dendrogram of clustered libraries. (B) Scatter plot for comparisons between arbitrarily selected cell types. Frequency tables of the 17 libraries were first normalized to expression levels per 55 000 tags. Cluster and tree view programs were used for clustering of SAGE data. Briefly, the frequency tables of the 17 libraries were first normalized to expression levels per 55 000 tags. SAGE tags appearing at least 5 times in all 17 libraries were subjected to the clustering analysis described in “Materials and methods.” Acti indicates activated; Mφ, macrophages.