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Syntheses, Chromatography and Specificity 133 mately 25°. One-centimeter quartz cells were used and the extinction coefficients per J>-aminophenyla!anine residue, e, calculated from the equation e =(1 /cd) log10 (/"/!) where Io is the intensity of the light emerging from the sol-vent, I the intensity of the light emerging from the solution' c the molar concentration of the />-aminophenylalanine residues, and d the thickness of the absorption cell in centimeters. Rehovoth, Israel

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