Objective To express the human monoclonal antibody against human tumor necrosis factor(h TNF)-α in CHO cells,then purify and identify the expressed product. Methods Plasmid p HL containing the genes encoding the variable and constant regions of light and heavy chains of human monoclonal antibody against h TNF-α was transfected to CHODG44 cells in mediation of LipofectamineTM2000,based on which the cell strain for secretory expression of monoclonal antibody against h TNF-α was screened by methotrexate(MTX)pr...