refers to the biological capability of certain substances—primarily antibodies, lectins, or specific proteins—to cause the clumping (agglutination) of cells or particles. This activity is a fundamental mechanism in immune defense, diagnostic testing, and clinical medicine. Core Mechanisms and Factors
Agglutination occurs when a multivalent "agglutinin" (such as an antibody) binds to specific surface antigens on multiple cells, creating a physical bridge that leads to the formation of visible aggregates. Fish & Shellfish Immunology - ScienceDirect.com agglutinating activity