Human Protein Reference Database - 2009 update. - T. S. Keshava Prasad; Renu Goel; Kumaran Kandasamy; Shivakumar Keerthikumar; Sameer Kumar 002; Suresh Mathivanan; Deepthi Telikicherla; Rajesh Raju; Beema Shafreen; Abhilash Venugopal; Lavanya Balakrishnan; Arivusudar Marimuthu; et al. (Nucleic Acids Res., 2009)