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Squibb KS, McDiarmid MA.Squibb KS, et al.Philos Trans R Soc Lond B Biol Sci. 2006 Apr 29;361(1468):639-48. doi: 10.1098/rstb.2006.1823.Philos Trans R Soc Lond B Biol Sci. 2006.PMID: 16687268Free PMC article.