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Pigment contents of the Synechococcus WH8102 cells at different growing temperatures. (A) With nitrate as the sole N source. (B) With urea as the sole N source. Zea, zeaxanthin; Chla, chlorophyll a. The results are the means of three biological replicates. Error bars denote ± SD of the mean (n = 3). Different letters indicate significant differences between treatments at P < 0.05.
