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Positive-ion MALDI-TOF mass spectra (m/z range 550 to 1,100 Da) of Microcystis strains PCC 7806 (axenic) (A), PCC 7813 (axenic) (B), HUB 5-3 (unialgal) (C), HUB 5-2-4 (unialgal) (D), and HUB 063 (unialgal) (E). For structure assignments, see Table 2.
