Fish hemoglobins. P.C. de Souza and G.O. Bonilla-Rodriguez. Braz J Med Biol Res 2007; 40(6): 769-778. 

Figure 3. Hemoglobins from the hybrid fish Tambacu (sample 1) and Tambaqui (Colossoma macropomum, samples 2 and 3), analyzed by isoelectric focusing.