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An active substance with antitumor activity (ARS2) was purified from the culture media of Chlorella vulgaris and found to be a glycoprotein with a molecular weight of 63,100 amu, as determined by matrix-assisted laser desorption/ ionization (MALDI) mass spectrometry. ARS2 contains 66.9% carbohydrate, mainly D-galactose, and 35.2% protein. The carbohydrate moiety has a beta-1,6-D-galactopyranose backbone, as determined by methylation analysis and 13C-NMR. Apparently, the protein moiety, whose 15 amino acid sequence at the NH2-terminus, we determined as DVGEAFPTVVDALVA, is necessary for the antitumor activity, as assessed by hydrazinolysis, periodate oxidation, and proteolysis.
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