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Different types of rice remains from the Zhiwuyuan site. (A) Modern rice with husk, (B) apex of rice husk, (C) rice spikelet base (non-shattering type), (D) rice spikelet base (shattering type), (E) rice spikelet base (protruding type), (F) mature rice grain, (G) embryos of rice grain, (H) big fragment of rice grain, (I) small fragment of rice grain, and (J) immature rice grain.
