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Phosphomannose Isomerase/Mannose Selection System to Screen Lc14-3-3 Transgenic Chrysanthemum Plants Phosphomannose Isomerase/Mannose Selection System to Screen Lc14-3-3 Transgenic Chrysanthemum Plants An Investigation of Medicinal Concha Ostreae of Xinghua City. Jiangsu Province EVOLUTION TENDENCY OF PLAEOCLIMATIC ENVIRONMENT IN THE WEST LOESS PLATEAU SINCE THE LATE PLEISTOCENE