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Micrographs of Nostocales strains investigated in this study. (a) Aphanizomenon flos-aquae; (b) Aphanizomenon gracile; (c) Aphanizomenon issatschenkoi; (d) Anabaena bergii; (e) Anabaena crassa; (f) Anabaena flos-aquae; (g) Anabaena lemmermanii; (h) Anabaena planktonica; and (i) Anabaenopsis elenkinii. Scale bars indicate 25 μm.
