APC and neoplasm: Therefore, APC mimicking nano‐/microplatforms such as magnetic beads or polymeric nanoparticles, are being developed to provide a high local concentration of tumor‐specific antigens and cytokines for durable T‐cell stimulation.172, 173 A recent study applied supported lipid bilayers (SLBs) to high‐aspect ratio MSRs to act as an APC mimic scaffold.