Table 1.

Mouse strains used.

Mouse strain	Transgene	Reference
Emx2	250 bp fragment deletion in the 5′ part of the homeobox with Neo insert	Pellegrini et al., 1996
Nfia	700 bp deletion including all but 9 bp of exon 2, with LacZ/Neo insert	Steele-Perkins et al., 2005
Fgf8flox	loxP sites were inserted in the intron upstream of exon 2 and another in the 3′-UTR allowing excision of exons 2 and 3	Meyers et al., 1998
Emx1cre	A nuclear localization signal-Cre-poly (A) signal was inserted, in the sense orientation, immediately 5′ to the Emx1 translational initiation site (ATG) into a PAC-Emx1 clone	Iwasato et al., 2004
Satb2	Deletion of exon 2 and Cre insertion (null allele)	Britanova et al., 2006
ROSA26-eGFPflox	a loxP-flanked STOP fragment lies between the eGFP gene and the Gt(ROSA)26Sor promoter	Mao et al., 2001