A Positron Emission Tomography (PET) Study to Investigate the Brain Biodistribution of 18F GSK2647544 in Healthy Subjects to Determine Its Ability to Cross the Blood-brain-barrier.

GSK2647544 100 mg will be supplied as a size 0 swedish orange hard gelatin capsules filled with white/slightly colored granule. Subjects will receive a single oral dose of GSK2647544 100 mg (2 X 50mg capsules) with 150 mL of tepid water approximately 2 hours prior to the IV infusion of \[18F\]-GSK2647544 and a PET scan.

\[18F\]GSK2647544 will be supplied as a clear, colourless solution free from visible particle. A maximum dose up to 2 mg with a maximum dose volume of 25 mL will be administered as IV bolus over 60 seconds.