Ranibizumab is a humanized monoclonal antibody fragment designed to target and inhibit vascular endothelial growth factor (VEGF), including VEGF110, VEGF121, and VEGF165. Ranibizumab's ability to selectively target and neutralize VEGF-A isoforms has made it a crucial component of research and treatment strategies for wet wet age-related macular degeneration (AMD).