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Isotopic enrichment (measured by IRMS) of GN-S and GN-I mats following 13CHO3- labeling and DCMU inhibition of photosystem II and photoautotrophy. Samples were collected after either 10 h of lighted label exposure, 10 h of light plus 12 h of darkness, or 12 h of darkness. Error bars are standard deviation of 4 replicate trials.
