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It does not, and the FDA's reasoning here is worth taking seriously

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Research investigations have shown that targeted peptides can specifically eliminate FOXO4+ senescent cancer cells, with implications for eradicating residual disease and serving as combination therapy for frontline cancer administration in experimental models

Treatment of rats with monocrotaline, a pyrrolizidine alkaloid, was also shown to increase the activity of GS to a comparable level as that of GCL (Yan and Huxtable, 1996)