How are agglutinins like security guards?

Agglutinins are a type of antibody that cause coagulation of particles and prevent foreign particles from entering a wound, just as a security guard would stop an unauthorized person from entering somewhere.

Agglutinins are a type of antibody. Antibody are proteins that specialize in recognizing foreign invaders in the body so that they can be eliminated. In the human body, agglutinins function by causing pathogens to clump together; they act as a sort of gum or glue, which make this pathogens to stick together, this inactivate the pathogens and marked them out for elimination from the human system. Thus, agglutinins act like security guards by arresting disease causing organisms that enter the body.