Lysis of Atlantic salmon erythrocytes by recombinant Plp protein (rPlp). 500 μl 5% fish (triangle) and sheep (square) erythrocytes were incubated with various concentration rPlp at 27°C for 20 h. The lysis of erythrocytes was measured at 428 nm. Erythrocyte resuspension buffer (10 mM Tris–HCl, 0.9% NaCl, pH 7.2) was used as negative control. All values were calculated from three independent experiments. Error bars show one standard deviation.