immune molecules.such as complement proteins.by doing this.it mediates different physiological effects aam时n l In summary.the fab region of the antibody determines antigen specificity while the fc region of the antibody determines the antibody's class effect.Since only the constant domains of the heavy chains make up the Fc region o fects.Possible classes of e alpha. ntib nd M of antibodies include:Opsonisation,agglutination,haemolysis,complement activation,mast cell degranulation and neutralisation (though this class e ffect may be mediated by the Fa st Fc mediated effects are directed a Function The main categories of antibody action include the following ggutination,in which antibodies"lue together"foreign cells into clumps that are attractive targets for phagocytosis e or ph soluble antigens,forcing them to precipitate ou tion (fix ation),in which an ntibodie that are vitn a membrane complex,w hiletoinfoiegnoalencourage i .Encouragement of inflammation by chemotactically attracting inflammatory cells Activated b cells differentiate into either antibody roducing cells called plasma cells that secrete soluble antibody or memory cells that survive in the body for years afte rememerded inde to allow the immun system to vided by oassive immunization from lating antibodies are prod by clor al B ce protein ute to i ty in t macrophages and other cells by coating the pathogen:and the trigger destruction of pathogens bysmothermmune rponsuhas the compeme paybesoier oactive amine degranulation to contributetoimmunity against certain types of antigens(helminths, Activation of complement res ling of bacteria in two ways. First,the binding of the antibo dy and complement molecule a pro 559 op nese pnag components for embrae tack complex tt antibodie to kl the bacerdi