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The concentration and distribution of ZEN in coix seeds. (Northeast China includes Liaoning and Heilongjiang Province; Eastern China includes Jiangsu, Zhejiang, Jiangxi, Shandong, Anhui, and Fujian Province; Central and Southern China include Henan, Hubei, Guangdong, and Guangxi Province, as well as Hong Kong and Taiwan; Northern and Northwest China include Beijing, Inner Mongolia, Hebei, Shanxi, and Shaanxi Province; Southwest China has Sichuan, Guizhou and Yunnan Province.).
