describe BMP
morphogen
DV pattern
smad tfs
organiser cells express antagonists
describe Wnt
morphogen
axis formation
antagonists act anteriorly
describe Shh
morphogen
limb patterning
GLI tfs
describe Hox
transcription factor
positional(hindbrain) AP
describe delta/notch
contact dependant
notch = receptor
neural cell fate if low delta notch
describe Ephs
guidance cues
boundary formation
describe robo
guidance cue
midline crossing
signalling pathway = Rho gtpases
describe NGF
growth factor
receptors are TrkA(high affinity) and p75NTR(low affinity)