Experimental electronic structures of the Fe IV =O bond in S=1 heme vs. nonheme sites: Effect of the porphyrin ligand - Augustin Braun; Leland B. Gee; Max D. J. Waters; Anex Jose; Michael L. Baker; Michael W. Mara; Jeffrey T. Babicz; Melanie A. Ehudin; David A. Quist; Ang Zhou; Thomas Kroll; Charles J. Titus; et al. (Proceedings of the National Academy of Sciences, 2025)