?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Emma&rft.au=Roberts%2C+Emma&rft.aulast=Roberts&rft.degree=Doctoral&rft.tpages=132&rft.title=Mammalian+DNA+ligase+II&rft.inst=UCL+(University+College+London)&rft.date=1994