Used in immunological research to study the complement system and its role in immune responses. It helps in understanding autoimmune diseases, immune complex disorders, and infections. Applied in assays to detect immune complexes and analyze complement activation pathways. Also utilized in developing therapeutic strategies targeting the complement system for conditions like lupus and rheumatoid arthritis. Additionally, researched for roles in neurodegenerative diseases such as Alzheimer's, involving clearance of damaged neurons.