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Neriifolin, a chymotrypsin-like serine protease, has been purified from the latex of Euphorbia neriifolia Linn. by ammonium sulfate precipitation, cation exchange chromatography and gel filtration. The molecular mass of the enzyme is 35.24kDa, with an isoelectric point of pH 5.7. The enzyme consists of 18 tryptophan, 25 tyrosine and 9 cysteine residues with 4 disulfide bridges. The extinction coefficient...
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