?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Smith%2C+Alexa&rft.aufirst=Alexa&rft.aulast=Smith&rft.tpages=134&rft.title=Functional+Analysis+Of+Receptor+Tyrosine+Kinases+Sek1+And+Elk+In+Neural+Crest+In+The+Xenopus+Embryo&rft.date=1997&rft.degree=Doctoral&rft.inst=UCL+(University+College+London)