Arterial plasma glucose concentration, net hepatic glucose uptake and net hepatic glucose fractional extraction in chronically catheterized conscious dogs receiving TPN (C), TPN and fructose (F), TPN and glucagon (GGN), or TPN and both F and GGN (F+GGN). NHGU (F+GGN vs C * p<0.005, F+GGN vs F + p<0.005; G vs C a p<0.005, GGN vs F b p<0.005). Glucose fractional extraction (F+GGN vs C * p<0.005, F+GGN vs F + p<0.005; GGN vs C a p<0.005, GGN vs F b p<0.005) Data are expressed as mean±SEM.