The primary objective is to assess the pharmacokinetics of 3 dose levels of plerixafor injection (160 μg/kg, 240 μg/kg, and 400 μg/kg) in healthy adult subjects of Japanese descent. Three cohorts of subjects will be enrolled. Approximately 8 subjects will be enrolled in each cohort, 6 subjects who will receive a single subcutaneous (SC) dose of plerixafor (160 μg/kg, 240 μg/kg, or 400 μg/kg), and 2 subjects who will receive a single SC dose of placebo. The lowest dose-level cohort (plerixafor 160 μg/kg) will be fully enrolled first, followed by the next highest dose-level cohort (plerixafor 240 μg/kg), and finally the highest dose-level cohort (plerixafor 400 μg/kg), provided safety criteria for dose escalation are met.