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nono by noelle's flower icon is the Rosy Periwinkle, a pretty plant native to the Old World tropics of Madagascar. In the 1950's, Rosy Periwinkle was discovered to contain two main alkaloids, vinblastine and vincristine, that have the unique ability to keep certain kinds of cancerous cells from reproducing. Vincristine is one of the most common chemotherapy drugs used in the treatment of childhood leukemia and has helped increase the survival rate for childhood leukemia from 10% to 95%.