Repositorio Institucional de la Universidad de Oviedo

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Work at the authors' laboratory was supported by Grant SAF2009-07227 from the Spanish Ministry of Science and Technology (MICINN)and by Grant IB09-066 from the Plan Regional de Ciencia y Tecnología del Principado de Asturias (PCTI). LCH, NA, JI, LU and MAP were recipients of fellowships from the PCTI. The IUOPA is supported by Obra Social Cajastur. We thank Dr. Kevin P. Dalton for critical reading of the manuscript.