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癌基因ｒａｓ蛋白在细胞的生长和分化中起重要的作用，其编码的蛋白分子量约为Ｍｒ２１０００，称Ｐ２１蛋白，Ｐ２１蛋白位于细胞浆膜内面．具有与鸟苷酸结合的能力和ＧＴＰ酶的活性，参与膜的信号传递［１］．癌基因ｒａｓ突变，特别是第１２，１３和６１密码子部位的点突变?
The oncogene ras protein plays an important role in the growth and differentiation of cells. The molecular weight of its encoded protein is about Mr21000, which is called P21 protein. P21 protein is located in the cytoplasmic membrane. Has the ability to bind guanylic acid and GTPase activity, involved in membrane signal transmission [1]. Oncogene ras mutations, especially point mutations at sites 12, 13 and 61 codons?