Well the first thing that will happen is a cell called a mass cell and a cell called a derivative cell will react to the antigens that are produced by that pathogen. So the pathogen will begin producing an antigen. And let's assume the antigen is some type of pathogenic peptide. So that is shown by these red dots. So let's begin with the mass cells. So mass cells on their surface contain these receptors and these receptors can bind antigens nonspecifically.