DAB condensed chromogen (hydrogen dioxide included, Zhongshan Company), rabbit anti-rat polyclonal antibody (Boster Co.,Ltd., Wuhan), fetal calf serum (PAA, Austria) and LG-DMEM medium (Sigma Company, USA) were used in this trial.

• DAB浓缩显色液(含过氧化氢,中杉公司),兔抗大鼠多克隆抗体(武汉博士德公司),FCS(PAA,Austria),LG-DMEM培养基(Sigma,USA)。