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Room temperature fluorescence induction kinetics in mesophyll and bundle sheath chloroplasts. Thylakoid protein samples (50 μg of Chl) were exposed to continuous illumination with green light (520 nm) in order to achieve homogeneous absorption. Fluorescence emission was measured in the near infrared region in the presence of the PSII inhibitor DCMU (20 μm). In B, the same data as in A are presented upon normalization of the variable fluorescence. a.u., absorbance units.
