Absorption spectra were recorded using a Perkin Elmer (Waltham, MA) Lambda-25 spectrophotometer as described before (24). In all experiments, an M455L3 (Thorlabs, Newton, NJ) 900 mW light-emitting diode with maximum emission at 455 nm was used for blue-green illumination of the samples (actinic light for OCPO→OCPR photoconversion).
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