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Light microscopy photographs of Congo red stained: (a) herbal pharmaceutical product JWXYS of brand A; (b) herbal pharmaceutical product JWXYS of brand B; (c) herbal pharmaceutical product JWXYS of brand C; (d) herbal pharmaceutical product JWXYS of brand D; (e) herbal pharmaceutical product JWXYS of brand E; (f) corn starch; (g) raw herbal powder; (h) corn starch: raw herbal powder = 1 : 1; and (i) raw herbal powder: herbal pharmaceutical product JWXYS of brand A = 1 : 1 (×100).
