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Treatment of cells expressing TRPV1 with FSK enhances TRPV1 responses to capsaicin-type ligands while diminishing the responses to eugenol-type ligands. In this study, we determined the effect of FSK on the activation of TRPV1 stimulated with vanilloid ligands, through the influx of Ca2+ in HEK293T cells expressing TRPV1. Our findings suggest that the effects of FSK can be attributed to the phosphorylation of TRPV1, as evidenced by using a protein kinase A inhibitor and TRPV1 mutants at potential phosphorylation sites. Furthermore, we examined the structure-activity relationship of 13 vanilloid analogs. 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