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Mössbauer spectra at 4.2 K of FNR+ cells (batch different from that in Figs. 1 and 2). Spectra of anaerobic cells (A, dash marks), air-exposed cells (A and B, solid line) and cells after removal of air and incubation under argon at 4°C (B, dash marks). The arrow marks the high-energy absorption feature of Fe2+, released by cluster conversion.
