英语翻译Ras functions as a relay switch that is positioned downstream of cell surface receptor tyrosine kinases and upstream of a cytoplasmic cascade of kinases that included the mitogen-activated protein kinases (MAPKs).
问题描述：
英语翻译
Ras functions as a relay switch that is positioned downstream of cell surface receptor tyrosine kinases and upstream of a cytoplasmic cascade of kinases that included the mitogen-activated protein kinases (MAPKs).
答
晕，没几个认识的词
答
RAS的作用相当于继电器开关,置于细胞表面受体酪氨酸激酶的下游和,包括促蛋白激酶（MAPKs）在内的激酶的细胞质级联的上游.