Repositorio Institucional de la Universidad de Oviedo

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This work was supported by NIH grant RO1-CA091901 (to J.R.), , INTAS grants YSF 00-208 (to B.O.) and YSF 00-186 (to A.L.), WUBMRC grant to B.O. and O.G., and grant Bg117b of the Ukranian Ministry of Education and Science (to V.F.). Research at the Oviedo was financed by grants of the Spanish Ministry of Science (BMC2002-03599 to C.M.) and a grant of the Plan Regional de Investigación del Principado de Asturias (GE-MEDO1-05 to J.A.S.).