3.    Results:
The brain regional distribution of [11C]CPPC was evaluated using healthy C57BL/6J mice. Animals were sacrificed at 5, 15, 30 and 60 min and %SUV calculated. 
·       Major [11C]CPPC uptake was seen in the frontal cortex with 150% SUV, between 5-15 min after radiotracer injection;
·       Blocking studies demonstrated the specific binding of [11C]CPPC only when correcting brain uptake for radioactivity concentration in blood (SUVR);
·       Results indicated a 20% decrease on radioactivity in mice treated with high doses of CPPC blocker;
·       The [11C]CPPC brain uptake has a small significant reduction in microglia-depleted mice; 
The [11C]CPPC brain