【Objective】This study aimed to investigate the culture conditions for suspension cell system established by safflower callus and the expression of CD20 complex fragment antibody by agrobacteriummediated transformation in safflower suspension cells.【Method】The safflower cotyledon was used as explants for callus induction to research the effects of different hormone combinations on callus induction.High quality callus were selected to explore the effects of different initial inoculation amounts,sucrose concen...