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Low-temperature ESR spectra of chlorophyllin with or without ascorbate and/or bathophenanthroline disulphonate (BCS). ESR measurements were carried out in 0.1 M phosphate buffer, pH 7.4, at 77K as described in Materials and Methods. The reaction mixtures contained 0.5 mM chlorophyllin, 2 mM ascorbate, or 2 mM ascorbate plus 10 mM BCS.
