CXCL9 and melanoma: A Tyr promoter-driven CXCL9 expression plasmid (pTyr-CXCL9, Supplementary Fig. 1c), expressing only CXCL9 specifically in melanoma cells, was constructed and encapsulated into NPTyr-CXCL9, which was used as a control for independently evaluating the efficiency of NPTyr-C9AP on T-cell recruitment.