Reagents included ammonium iron(III) citrate (Sigma Aldrich, F5879), ferric chloride (Sigma Aldrich, 44939), 2,2-bipyridyl (Sigma Aldrich, 366-18-7), 4,4-bipyridyl (Sigma Aldrich, 533-26-4), hydrogen peroxide (Sigma Aldrich, H10009), CID1067700 (Sigma Aldrich, 1067700), dynasore hydrate (Sigma Aldrich, D7693), bafilomycin A1 (Sigma Aldrich, B1793), nigericin (Sigma Aldrich, N7143), iron dextran (Sigma Aldrich, D8517), BAPTA-AM (Invitrogen, B6769), acridine orange (Calbiochem, 113000), and torin 1 (Tocris Bioscience, 4247). Trans-Ned-19 and a cell-permeant version of NAADP (NAADP-AM) were synthesized as previously described.28,76 (link)