Antioxidant and Antityrosinase Activities of Ethanolic Pachyrhizuserosus Peel and Tuber Extract by Irma Dolsyeria Siregar, Hanna Sari Widya Kusuma, Wahyu Widowati, Hans Hotma Marpaung, Sahna Ferdinand, Edy Fachrial, I Nyoman Ehrich Lister

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