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HPLC chromatograms of the MA-octreotides produced at pH 8.0 (a), 8.5 (b), and 9.0 (c). Peaks 1, octreotide; 2, mono-MA-Lys5-octreotide; 3, mono-MA-Phe1-octreotide; and 4, di-MA-octreotide