So let's begin by discussing what the structure of a B lymphocyte is. So here we have a B lymphocyte and notice that the B lymphocyte contains these receptors on its membrane and they're known as B cell receptors. So let's suppose we have a pathogen that makes their way into our body and that pathogen one way or another will release antigens. Now these antigens can either float around our blood, our lymph or our tissue. Or the antigens can be picked up by some other type of white blood cell. For example a dendritic cell or a macrophage.