Scintigraphy Study to Assess Gastric Emptying in Healthy Subjects Given GSK716155 or Placebo.

Inclusion Criteria: * Healthy men or women, between the ages of 18 and 65, and have a Body Mass Index (BMI) of between 20 and 32. * If female, the subject must be not be capable of having children. Exclusion Criteria: * Subjects must not use tobacco, nicotine, or illegal drugs of abuse, and must not take caffeine or alcohol for 24 hours before dosing and before each set of scintigraphy procedures. * Subjects may not have HIV, hepatitis, elevated fasting blood sugar levels, high blood pressure, heart, lung, liver, gall bladder, gastrointestinal, pancreatic, or kidney disease, or untreated thyroid disease. * Subjects must not have a history of alcohol abuse, must not take prescription or non-prescription drugs within 7 days of Day 1 and Day 8 of the study, and must not have previous exposure to any GLP-1 mimetic or exenatide. * Prior radiation exposures must meet certain limits in order to participate in this study.