... sample on exposure to light. On addition of NADPH, however, the absorptionmaximum shifts back to 640 nm and photoconvertibility isrestored. These changes are attributed to the conversion of photoconvertible ... for the existence of a POR-phosphatase is the observation by Wiktorsson et al. [9] of an inhibition, by NaF and ATP, of the loss of the long-wavelength form of Chlide following photoconversion ... forPOR-PChlide640reformation. The disappearance of POR-PChlide650and the reorganization of the PLB, however, areirreversible. Restoration of low-pH treated PLB to pH 7.5leads to a further breakdown down of the...