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Depth profiles of Prochlorococcus and Synechococcus at station M1. Open circles, percentages of Prochlorococcus and Synechococcus SSU rDNAs measured by a 5′-nuclease assay using set PHPICO relative to bacterial SSU rDNA measured by a 5′-nuclease assay using set BACT2; closed squares, percentages of Prochlorococcus and Synechococcus cell numbers relative to total bacterioplankton cell numbers measured by flow cytometry.
