Winona C. Barker John S. Garavelli Peter B. McGarvey Christopher R. Marzec Bruce C. Orcutt Geetha Y. Srinivasarao Lai-Su L. Yeh Robert S. Ledley Hans-Werner Mewes Friedhelm Pfeiffer Akira Tsugita Cathy H. Wu The PIR-International Protein Sequence Database. 39-43 1999 27 Nucleic Acids Research 1 db/journals/nar/nar27.html#BarkerGMMOSYLMPTW99