Dendritic cells also contribute to the function of B cells and help maintain their immune memory. Dendritic producing cytokines and other factors that promote B cell activation and differentiation. After an initial antibody response has occurred due to an invading body, dendritic cells found in the germinal centre of lymph nodes seem to contribute to B cell memory by forming numerous antibody-antigen complexes. This is to provide a long lasting source of antigen that the B cells can take up themselves and present to T cells.