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Three new cysteine peptidases (araujiain h-I, araujiain h-II and araujiain h-III) were isolated and purified to mass spectroscopy homogeneity from the latex of Araujia hortorum (Asclepiadaceae) fruits by ultracentrifugation and ion exchange chromatography. The enzymes have molecular masses of 24,030.87, 23,718 and 23,545.5 (mass spectrometry), respectively. The peptidases were activated by thiol compounds...
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