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(A) Fluorescence emission spectra of aromatic amino acids in untreated spinach chloroplasts in presence of compound 6: 0, 0.011, 0.026, 0.037, 0.053 and 0.11 mmol/L(curves from top to bottom; λex = 275 nm). (B) Dependence of fluorescence intensity of aromatic amino acids on concentration of compounds 2 (squares), 11 (triangles) and 6 (circles).
