The knockouts were obese and loved to eat: by 10 weeks of age, PYY knockout mice weighed about 37.5% more than normal mice and had about 12% more body fat.

• 敲除小鼠体重肥胖且酷爱进食。10个星期大小的敲除小鼠要比它们的正常同类重37.；5%25，体内脂肪也要多12%25