Fig. 1.

Cyanobacterial strains that produce BMAA representing different morphological sections. (a) The bloom-forming, filamentous, and colony-forming Trichodesmium thiebautii (section III). (Scale bar: 100 μm.) (b) The unicellular Synechococcus PCC 6301 (section I). (Scale bar: 1 μm.) (c) The filamentous Symploca PCC 8002 (section III). (Scale bar: 10 μm.) (d) The filamentous, nonbranching, and heterocystous (H) Nostoc PCC 7107 (section IV). (Scale bar: 10 μm.) (e) The filamentous, heterocystous (H) and branching (arrow) Fischerella PCC 7521 (section V). (Scale bar: 15 μm.)