In order to study the upstream and downstream components in g protein and calmodulin signal pathways , a yeast two - hybrid system was used to screen interaction partners of these two proteins 本文利用酵母双杂交系统分别筛选了与这两种蛋白相互作用的蛋白质,以进一步研究g蛋白和cam信号转导途径中的其它上下游组分。