<prompt> Antibodies acting predominantly on the mucosal cells belong to -IgG classIgM classIgE classIgA class  <response>: - IgA is selectivity concentrated in secretions and on mucus surfaces forming an antibody paste and is believed to play an impoant role in local immunity against respiratory and intestinal pathogens. - inhibits the adherence of micro organisms to the surface of mucosal cells by covering the organisms and thereby preventing their entry into body tissues. Reference : Anathanarayan panikers 9th edition, pg no: 97 p 