Objective To clone the gene of transforming growth factor-β_1( TGF-β_1) and transfect it into hepatic stellate cells(HSC) to screen positive clones that stably express TGF-β_1.Methods The specific fragment was amplified from rat osteoblasts by reverse transcription polymerase chain reaction( RT-PCR), confirmed by enzyme digestion of rat TFG-β_1 cDNA, and inserted into the pcDNA3.1( +) expression vector,the pcDNA3.1( +)-TGFβ_1 recombinant plasmid was constructed. The TFG β_1 expression vector was introduced ...