Comparison on accumulation of flavonoids in loose and compact callus suspension cell culture of Tetrastigma hemsleyanum Comparison on accumulation of flavonoids in loose and compact callus suspension cell culture of Tetrastigma hemsleyanum Molecular cloning, bioinformatics characterization, and gene expression analysis of full-length expansin gene cDNA from Tetrastigma hemsleyanum Study on leaf transpiration and stomatal structure of medicinal plant Tetrastigma hemsleyanum Chemical constituents in root tuber of Tetrastigma hemsleyanum and their anti-oxidative activities