A Study to Evaluate the Safety, Immunogenicity, and Pharmacokinetics of GR2303 in Healthy Adult

This is a randomized, double-blind, placebo-controlled study to evaluate the safety, tolerability, pharmacokinetics, and preliminary pharmacodynamic profile of GR2303 Injection in healthy adult Chinese subjects. After signing the informed consent form, subjects who meet the criteria for enrollment will be entered into different groups according to the randomization number. Subjects will be enrolled in only one of these groups.