74 CHARACTERIZATION OF THE HEMATOPOIETIC STEM AND PROGENITOR CELL HIERARCHY IN MYELODYSPLASTIC SYNDROMES PATIENTS WITH MONOSOMY 7 AS THE SOLE CYTOGENETIC ABNORMALITY. Issue 1 (April 2015) - Dimitriou, M.; Mortera-Blanco, T.; Woll, P.S.; Karimi, M.; Doolittle, H.; Wedge, D.C.; Papaemmanuil, E.; Jacobsen, S.E.; Hellstrom-Lindberg, E.