... ). In Drosophila,ey can induce ectopic so and optix expression and ectopic eye formation induced by co-expression of so with eya results in the activation of the ey gene( Halder et al., 1998 ; Niimi et al., 1999 ; Pignoni et al., 1997 ; Seimiya and Gehring,2000 ). Some differences between fly...