INCLUSION CRITERIA:
All subjects must be healthy and aged 18-65 years.
EXCLUSION CRITERIA:
The exclusion criteria are shown below:
- Current psychiatric disease, substance abuse or severe systemic disease based on history and physical exam.
- Laboratory tests with clinically significant abnormalities.
- Prior participation in other research protocols or clinical care in the last year such that radiation exposure including that from this protocol would exceed the guidelines set by the Radiation Safety Committee (RSC).
- Pregnancy and breast feeding.
- Positive HIV test.
- Cannot lie flat for 2 - 3 h.