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Molecular cloning of methionine-metaboly correlated cDNA in Astragalus melilotoides Pall.variant line and its expression in E.coli in vitro Screening Procedure of Hydroxyproline-resisitant Lines of Gerbera hybrida Isolation and Characterization of a Chinese Aneurolepidium Cell Line Resistant to Hydroxyproline Studies on Isolation and Characteristics of a Sugarcane Cell Line Resistant to Hydroxyproline (HYP) A PRELIMINARY STUDY ON PREDICTION METHOD FOR POPLAR CANKER In vitro selection of salt and PEG tolerant flaxi lines from the progeny of flown seeds SELECTION OF UDMH TOLERANT VARIANT LINES OF AN AQUATIC REED