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Maximum likelihood phylogenies (PhyML) of MGII (a), SAR86 (b) and Flavobacteria (c) 16S rRNA genes sharing >97% sequence identity with OTUs, which assimilated (red font), or did not assimilate (bold black font), protein after a 24 h incubation. Colored squares indicate the size fraction where protein assimilation was observed. Black circles at nodes represent bootstrap support of >90% and white circles represent bootstrap support of >50%. Numbers represent NCBI GI accession IDs.
