Notes: Cyclosporin H is a natural cyclic undecapeptide that selectively antagonizes the formyl peptide receptor at concentrations ranging from 0.1 to 10 µM.{28067,28068,28069} Unlike cyclosporin A (Item No. 12088), cyclosporin H does not bind cyclophilin to evoke an immunosuppressant response.{28070} Cyclosporin H has been reported to inhibit phorbol ester-mediated effects in mouse skin and block calcium/calmodulin-dependent EF-2 phosphorylation in vitro.{28071}