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Environmental cobalamin and Cyanobacteria carbon. No significant correlation exists between calculated carbon from Cyanobacteria and cobalamin. Shade of circle is the source of the calculated Cyanobacteria carbon (from 100% Synechococcus to 100% Prochlorococcus). Cobalamin concentrations are summed values of the detected beta ligands for these compounds, as in Fig. 2.
