The authors are indebted to the members of the SBI laboratory for their involvement in the fruitful discussions on the project.
Emre Guney is grateful to the financial support from "Departament d'EducaciĆ³ i Universitats de la Generalitat de Catalunya i del Fons Social Europeu".
This work was supported by grants from Spanish Ministry of Science and Innovation (MICINN) BIO2008-0205, and with FEDER support, PSE-0100000-2007 and PSE-0100000-2009.
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