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Light microscopy photographs of Congo red staining of Yin-Chen-Hao-Tang in preparations of pharmaceutical products: (a–d) products from brands A–D; raw herbal powders: (e) Artemisia capillaries Thunb; (f) Gardenia jasminoides Ellis; (g) Rheum officinale Baill; and (h) Yin-Chen-Hao-Tang decoction.
