Northern hybridization (Fig.4)and immunoblotting analysis (Fig.3) showedthe EGFR gene expression products in 7404and 7721 cells were 5.6 Kb mRNA and 170Kilo-dalton glycoprotein.

• Northern杂交分析证明EGFR基因在7404；7721细胞中的转录产物主要是5.；6 kb EGFR mRNA；免疫印迹分析证明7404细胞和7721细胞的EGFR为170kd的蛋白。