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This work was supported by an operating grant from the Canadian Institutes of Health Research (CIHR) to A.S. (MOP #110947), and student scholarships from Fundac¸a˜o Portuguesa para a Cieˆncia e a Tecnologia (FCT; SFRH/BD/32953/2006) and Fonds Que´be´cois de la Recherche sur la Nature et les Technologies (FQRNT; merit scholarship program for foreign students) to S.G. A.S. is the recipient of a Canada Research Chair in postnatal neurogenesis (950- 218183).