Scopus-Elsevier Bateman, A, Coin, L, Durbin, R, Finn, R D, Hollich, V, Griffiths-Jones, S, Khanna, A, Marshall, M, Moxon, S, Sonnhammer, E L L, Studholme, D J, Yeats, C & Eddy, S R 2004, ' The Pfam protein families database ', Nucleic acids research., vol. 32, pp. D138-D141 . https://doi.org/10.1093/nar/gkh121