Gene Expression Profiling of Hairy Cell Leukemia reveals a Phenotype Related to Memory B Cells with Altered Expression of Chemokine and Adhesion Receptors Katia Basso, Arcangelo Liso, Enrico Tiacci, Roberta Benedetti, Alessandro Pulsoni, Robin Foa, Francesco Di Raimondo, Achille Ambrosetti, Andrea Califano, Ulf Klein, Riccardo Dalla Favera, and Brunangelo Falini.