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Bulk (<5-μm fraction) sample incubated with 13C-labeled bicarbonate and 15N2. Isotope ratios of 15N/14N versus 13C/12C in cells incubated from 2100 to 0900 hours (open symbols) and incubated from 0900 to 2100 hours (closed symbols). The dotted lines represent the natural abundance levels of 13C/12C and 15N/14N isotope ratios.
