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Phylogenetic distribution of multicellularity among eukaryotes. Large U, only unicellular forms; large M, only colonial/multicellular forms; middle-sized U and M, clade with both unicellular and colonial/multicellular forms; large U and small M, mainly unicellular forms with rare colonial/multicellular forms (Baldauf 2003; King 2004; Grosberg and Strathmann 2007; Prochnik et al. 2010)
