FIG. 3.

PSD spectrum of microcystin-LR: m/z 995 [M + H]⁺, 861 [M − 134 (Adda side chain) + H]⁺, 599 [Arg−Adda−Glu + H]⁺, 375 [C₁₁H₁₄O−Glu−Mdha]⁺, 286 [Arg−MeAsp + H]⁺, 213 [Glu−Mdha + H]⁺, 155 [Mdha−Ala + H]⁺, 135 [PhCH₂CH(OCH₃)]⁺, and 70 [Leu − CO + H]⁺.