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Cells of Synechococcus 6301 were briefly exposed to a phycocyanin-absorbed light in the presence of DCMU. PS II trap closure was then estimated from fluorescence induction measurements with excitation light absorbed predominantly either by chlorophyll or by phycocyanin. In cells adapted to light-state 2, the exposure to light absorbed by phycocyanin closed only a proportion of the PS II centres that could be closed by exposure to light absorbed by chlorophyll. This distinction was reduced indoi:10.1016/0014-5793(90)80114-x fatcat:7p2ap4uipfdxdgr7th6grzon2i