Fig. 5. The expression and activation of the relevant Wnts in the mouse retinas. The expression of Wnts in mammalian retina is schematically summarized from a previous report (Liu et al., 2003). Tcf-binding-site-dependent EGFP expression was examined in the explanted retina from E17 by using TCF-binding-site-EGFP plasmid as described in the Results section.