Fig. 5. The effect of increased input pressure (kPa) on maximum in situ stroke volume (A, ml kg^–1) (B, ml g ventricle^–1) of transgenic and control Atlantic salmon hearts. (A) Transgenic salmon (N=7) are represented by open circles (y=0.36+0.14x–0.002x², R²=0.98) and controls (N=8) are represented by closed circles (y=0.43+0.11x–0.002x², R²=0.99). (B) Transgenic salmon are represented by open circles (y=0.45+0.18x–0.003x², R²=0.99) and controls are represented by closed circles (y=0.64+0.17x–0.003x², R²=0.99). Curves were fitted using second order regressions. Values are means ± 1 standard error.