Figure 1From: Quality assurance for Chinese herbal formulae: standardization of IBS-20, a 20-herb preparationMicroscopic features of cross section. (a) Phellodendron chinensis bark. (b). Phellodendron amurense bark 1: Cork; 2: Cortex; 3: Stone cells; 4: Prisms of calcium oxalate; 5: Phloem; 6: Phloem fibres and crystal fibres; 7: Phloem rays.Back to article page