The immune system ignores cells with these markers. E. Antigens These are large molecules that initiate an immune response. The constant regions are the same for all antibodies in a particular class. The variable region differs for every different antibody, of which there are countless numbers. The base of the Y binds to B cells.
Antibodies recognize specific antigens.
Antibodies are produced by B cells. They are concentrated in lymph nodes and other organs. They have cell surface receptors to detect antigens. Antibodies stick out from cell surface. Functioning in recognizing between self and no-self.