?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Singh%2C+Mahender+Kumar&rft.aulast=Singh&rft.aufirst=Mahender+Kumar&rft.date=2005&rft.issn=1362-4962&rft.atitle=HaptenDB%3A+A+database+of+hapten+molecules.&rft.title=Nucleic+acids+research&rft.genre=article