There is a scandent shrub in the Medicinal Herb Garden in Kunming Expo Garden called Caulis Spatholobi. If it is cut by the knife, it will bleed like human’s fingers are cut. Cut its stem into slice and soak it into hot water, some blood will spread in the water, and finally the water will become pink. The “blood” in the plant, unlike human blood containing erythrocyte, leucocyte and blood platelet, is consisted of tannic acid, colloid, mixed proteoglycan protein, etc. It has glycoprotein chain link molecules, so it has blood types as human’s blood.
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