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Proportion of O. alexandrii 16S rRNA gene copies recovered from RNA-SIP gradient fractions. O. alexandrii was grown in coculture with N. piranensis in medium containing 13C-labeled bicarbonate (solid black line) and on N. piranensis supernatant (dashed black line). Growth in medium containing unlabeled yeast extract-peptone and 13C-labeled bicarbonate served as a control (solid gray line).
