PSMα3 TFA is a peptide utilized in directing dendritic cells (DCs) towards a tolerogenic state, pivotal for DC vaccination approaches. It intrudes and recalibrates human monocyte-derived DCs, disrupting maturation triggered by TLR2 or TLR4, suppressing both pro-inflammatory and anti-inflammatory cytokine secretion, and diminishing antigen assimilation. Notably, PSMα3 TFA constitutes a significant toxin secreted by highly virulent methicillin-resistant Staphylococcus aureus (MRSA) strains [1] [2].