ABBV-552

A Study to Assess the Adverse Events and How Oral ABBV-552 Capsules Moves Through the Body of Healthy Adult Japanese and Han Chinese Participants

A Study to Assess the Mass Balance of [14C] ABBV-552 in Healthy Male Participants Following Single Oral Dose Administration

Study to Assess Adverse Events, Change in Disease Activity and How Oral ABBV-552 Capsules Moves Through the Body of Participants Aged 50 to 90 Years With Mild Alzheimer's Disease

A Randomized, Double-blind, Placebo-controlled, Dose-finding Study to Evaluate the Safety, Efficacy, Pharmacokinetics, and Pharmacodynamics of ABBV-552 in Participants with Mild Alzheimer's Disease.