UCLA RESEARCHERS LOOKING FOR healthy right-handed subjects, ages 18-50, to participate in study investigating brain’s response to immune system changes. Eligible subjects will first come to the lab for 1 hour and then come to the second 8-hour session on a different day. Study involves the injection of placebo or endotoxin (which increases immune system activity in a safe manner), blood draws, and brain scan. Subjects who complete the study will be paid $220. If interested please email firstname.lastname@example.org or call (310) 825-0658.