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The enzymatic activity of α-chymotrypsin chemically modified with monomethoxypolyethylene glycol (α-CT-PEG) is discussed using as test reactions the hydrolysis of esters different from the natural substrates of the enzyme, and the peptidic synthesis. These reactions allowed the analysis of the dimensions of ar , h , n and am subsites of α-CT-PEG. Using 2-aminoethanol esters and derivatives...