Gabrielle A. Reeves Karen Eilbeck Michele Magrane Claire O'Donovan Luisa Montecchi-Palazzi Midori A. Harris Sandra E. Orchard Rafael C. Jimenez Andreas Prlic Tim J. P. Hubbard Henning Hermjakob Janet M. Thornton The Protein Feature Ontology: a tool for the unification of protein feature annotations. 2767-2772 2008 24 Bioinformatics 23 http://dx.doi.org/10.1093/bioinformatics/btn528 db/journals/bioinformatics/bioinformatics24.html#ReevesEMOMHOJPHHT08