Abstract
A new method of preparing and purifying the haem undecapeptide of cytochrome c is reported. The Mössbauer spectra of solid samples, lyophilized at pH 7 from water, show mainly the presence of low-spin ferric iron, in contrast with earlier reports. No evidence of temperature dependent spin-spin equilibria was observed. A small proportion of the haem (∼ 15%) inhabits an environment distinctly different from that of the majority. These observations are discussed.
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