Table 2. FGFs induce Wnt8a expression in chick explant culture.

Explants of chick HH stage 4-5 rostral ectoderm were cultured in the absence (control) or presence of FGF protein-soaked beads and assayed for chick Wnt8a expression. The fraction of all explants showing any Wnt8a expression is indicated in the first column, and the number of explants exhibiting strong (++), weak (+), or no (-) expression of Wnt8a is indicated is indicated in subsequent columns.

Beads	Wnt8a pos./total	Wnt8a ++	Wnt8a +	Wnt8a -
Control	1/10	0	1	9
FGF4	11/12	10	1	0
FGF3	4/12	0	4	8
FGF10	1/12	0	1	11

++ = strong expression

+ = weak expression

- = no expression