This study will use microscopic particles of a human protein called albumin in the form of microspheres to simulate bacteria in the blood. We can detect these microspheres by attaching a radioactive label to the spheres and measuring emission in a detector called a gamma counter. The level of radiation is quite small and similar to a bone scan. We have previously shown that healthy liver rapidly clears these albumin microspheres from the blood. We have also shown previously that after major liver surgery there is a delay in clearance of microspheres, which we believe equates to a poorly functioning innate immune system.