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Sperling, Erik A. and Peterson, Devin J. and Pisani, Davide (2009) Phylogenetic-Signal Dissection of Nuclear Housekeeping Genes Supports the Paraphyly of Sponges and the Monophyly of Eumetazoa. Molecular Biology and Evolution, 26 (10). pp. 2261-2274. ISSN 0737-4038