This invention relates to methods and compositions useful for delivering antigens to dendritic cells which are then useful for inducing antigen-specific cytotoxic T lymphocytes and T helper cells. A stack of an MR element has a stacked structure comprising an underlayer, an antiferromagnetic layer, a ferromagnetic layer, a first nonmagnetic layer, a first soft magnetic layer, a second soft magnetic layer, a second nonmagnetic layer and a high-resistance layer, which are stacked in sequence on the underlayer. The droplets are then transferred to a substrate. The processor signals the display to individually present each of the pages.