BioPortal: ontologies and integrated data resources at the click of a mouse.
Natalya Fridman NoyNigam H. ShahPatricia L. WhetzelBenjamin DaiMichael DorfNicholas GriffithClément JonquetDaniel L. RubinMargaret-Anne D. StoreyChristopher G. ChuteMark A. MusenPublished in: Nucleic Acids Res. (2009)