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Negi et al. (2017) "3β-Hydroxy-urs-12-en-28-oic Acid Modulates Dietary Restriction Mediated Longevity and Ameliorates Toxic Protein Aggregation in C. elegans." J. Gerontol. A Biol. Sci. Med. Sci. 72(12):1614-1619 (PubMed)