CD8A and neoplasm: 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.