Given that the loss of natural membrane functions in aAPCs might interfere with T cell activation, Zhang et al. conjugated MHC1‐OVA and anti‐CD28 to azide‐modified leukocyte membrane fragments and then coated them onto magnetic nanoclusters.128 The reinfused CD8+ T cells could be visually monitored by using magnetic resonance imaging (MRI), and the accumulation at tumor tissue could be manipulated with the assistance of magnetic field. The gene discussed is CD28; the disease is neoplasm.