The Norepinephrine Transporter: A Novel Target for Imaging Brown Adipose Tissue

Inclusion Criteria: * age 18-30 yrs * BMI \< 24 kg/m2 * Caucasian Exclusion Criteria: * Current neuro-psychiatric illness * substance abuse * medical or neurological illnesses likely to affect physiology or anatomy, i.e., uncontrolled hypertension, cardiovascular disorders * current pregnancy * current breast feeding * suicidal ideation or behavior * use of medications which potentially affect NET binding within 2 weeks of the PET scans.