The SUV comparisons of [18F]TZ4877 (S1PR1: AD, n = 5; EA, n = 5; WT, n = 5) and [18F]AV45 (Aβ: AD, n = 5; EA, n = 5; WT, n = 3) in AD, WT, and EA groups at 30 minutes post‐injection. The gene discussed is S1PR1; the disease is Alzheimer disease.