Mitogenic and blast-transforming properties of phytohemagglutinin Phaseolosaxin of the Bulgarian production, and of its three fractions have been studied in vitro. The greatest part of the biological activity is due to fraction 1, which represents, in fact, a highly purified phytohemagglutinin. These results may be useful in regard to the large scale of application of Phaseolosaxin.
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