Answers are grounded in this paper and cite their sources.
The magnetic hyperfine structure observed in the (57)Fe Mössbauer spectra of the high-potential iron protein from Chromatium shows that the iron atoms are inequivalent in pairs, with hyperfine fields of 121 and 90kG.
No takes yet. Share an insight, caveat, or question.
Evans et al. (1970) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: