– Peptide P60 (FOXP3 inhibitor P60) is a 15-mer synthetic peptide, cell-permeable inhibitor of FOXP3, binds specifically to FOXP3; inhibits murine and human-derived Treg and improves effector T cell stimulation, overcomes the inhibitory effect of FOXP3 on the activity of the transcription factors NF-?B and NFAT, inhibits upregulation of mRNA for Foxp3 and IL-10 on effector T cells and enhances mRNA for IFN-? after anti-CD3 stimulation; induces a scurfy-like disease in newborn mice, improves vaccine efficacy in mice model of CT26 tumor and HCV infection.