Fig. 7. Models of Wnt11/5a signaling activity in dorsal axis formation. (A) Model 1. The relative distribution of Wnt11 and Wnt5a protein in eight-cell stage and Wnt signaling activity at late blastula stage embryos as described in the text. (B) Model 2. Possible composition of the Wnt11/5a signaling complexes, as described in the text.