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Polyhydroxybutyrate (PHB) in Stigeoclonium sp. B23 at day 6 (A,C) and day 12 (B,D) of cultivation. The arrows indicate where the yellow fluorescence was detected in the form of PHB granules after 12 days of cultivation. The PHB storage was not uniform in the filaments, but the highest amount of fluorescence was detected in no nitrate treatment; (A,B): no nitrate; (C,D): standard medium.
