Microarray analysis. Eisen tree map computed using the GeneSpring “gene” tree and the Pearson correlation equation on the modulated probe sets belonging to GO categories of (A) “Cytoskeleton Organization and Biogenesis”; (B) “Cell Motility,” “Small GTPase Mediated Signal Transduction,” and “RHO Protein Signal Transduction”; and (C) “Cell Adhesion.” The signal-based coloring legend is shown at the bottom of the figure. Gene profiling of HSCs was performed after 24 hours of incubation with UTP and CXCL12.