At high level
,
RCAS
wnt 3a and Beta
catenin convert
Bilateral (b) symmetric
flight feathers Into
radial symmetric (r)
feathers.
Some vanes are
chimeric!
At low level
,
a new
ectopic rachis is
induced.
Altering Wnt 3a gradients
change feather forms
ectopic wnt gradient
ectopic rachis
Wnt 3a
all over