A First in Human, Single Ascending Dose Study of ABBV-1451 to Evaluate the Pharmacokinetics, Immunogenicity, Safety, and Tolerability in Healthy Subjects and in Japanese and Han Chinese Healthy Subjects

Inclusion Criteria: * A condition of general good health, based upon the results of a medical history, physical examination, vital signs, laboratory profile and a 12-lead ECG. * Applies to Part 2 only: * For Japanese participants: \-- Participant must be first or second-generation Japanese of full Japanese parentage, residing outside of Japan. First generation participants will have been born in Japan to two parents and four grandparents also born in Japan of full Japanese descent. Second-generation participants born outside of Japan must have two parents and four grandparents born in Japa…