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Reeves, G.A. and Eilbeck, K. and Magrane, M. and O'Donovan, C. and Montecchi-Palazzi, L. and Harris, M.A. and Orchard, S. and Jimenez, R.C. and Prlic, A. and Hubbard, T.J. and Hermjakob, H. and Thornton, Janet M. (2008) The protein feature ontology: a tool for the unification of protein feature annotations. Bioinformatics 24 (23), pp. 2767-2772. ISSN 1367-4811.