b. Subjects Patients are admitted to the burn unit within 48 h of injury. Fluid resuscitation is provided as previously described (94). Within 48 h of admission, the burn wound is excised and subsequently grafted by autograft or cadaveric allograft. Patients typically return to the operating room for reharvesting of donor sites every five to seven days. The experiments proposed here will be performed the day prior to the third surgery at day 12-15, as femoral catheters are normally inserted at the time for access during surgery. Enteral feeding with Vivonex TEN (Sandoz Nutrition Corp, Minneapolis, MN) is started within 24h of admission and continued until the patient is capable of food by mouth. All patients will be eligible for the study unless one of the exclusion criterion listed below apply.