?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Singh%2C+Devender&rft.aufirst=Devender&rft.aulast=Singh&rft.tpages=335&rft.title=A+mutational+analysis+of+the+regulation+of+retroviral+transcription+in+embryonic+stem+cells&rft.inst=UCL+(University+College+London)&rft.degree=Doctoral&rft.date=1994