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. 2022 Sep 30;8(39):eabf4792. doi: 10.1126/sciadv.abf4792

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Fig. 1. — (A) Illustration showing the experimental setup. Exogenous nutrients were added to an existing Synechococcus–heterotrophic bacterial mutualistic coculture system, and Synechococcus growth was monitored for 450 days. The time scale below the culture flasks illustrates the start and end of each phase with their corresponding observed (visually) color change. (B) Real-time visual color change within the coculture system and in the axenic Synechococcus sp. PCC7002 culture.