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Rate of photo-oxidized P700 reduction by PMS. The 830 minus 875 nm absorption signal is monitored after P700 is oxidized by a 20 mmol/m2/s light pulse with a duration of 0.2 s. PMS/NaAsc concentrations were as in previous reports: 10 μM/10 mM (e.g., Ihalainen et al. 2005), 60 μM/40 mM (Slavov et al. 2008), and 150 μM/5 mM (Byrdin et al. 2000)
