NAAA and hemophagocytic syndrome: In addition, after treatment with CD41‐PLT‐VP16, the percentage of F4/80+ inflammatory cells according to immunohistochemistry (IHC) of liver and spleen tissue slices from mice with HLH was reduced by 23% and 18%, respectively, compared with that in the VP16 and PLT‐VP16 treatment groups (Figure 3E; Figure S3H, Supporting Information).