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Whitehouse DB, Tomkins J, Lovegrove JU, Hopkinson DA, McMillan WO (May 1998). "A phylogenetic approach to the identification of phosphoglucomutase genes". Mol Biol Evol. 15 (4): 456–62. doi:10.1093/oxfordjournals.molbev.a025942. PMID9549096.