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Total cylindrospermopsins concentrations in +N (♦) and −N (◊) batch cultures of three Aphanizomenon sp. strains and relative proportion of the precursor metabolite D-CYN (+N: ▲ and −N: ∆). CYNs concentrations are normalized to the concentrations at the beginning of the culture (value at day 0 = 1) for direct comparability. Real CYNs concentrations at starting points are given in Table 1.
