G protein signaling pathways
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G proteins, short for guanine nucleotide-binding proteins, are a family of proteins involved in second messenger cascades. G proteins are so called because they function as "molecular switches". They alternate from 'inactive' guanosine diphosphate (GDP) to 'active' guanosine triphosphate (GTP), which is a binding state, and which proceeds to regulate downstream cell processes. Source: [[wikipedia:G_protein|Wikipedia]]
G蛋白，全称为鸟苷酸结合蛋白，是一类参与第二信使级联反应的蛋白质家族。G蛋白之所以得名，乃因其充当‘分子开关’的角色。它们在无活性状态的鸟苷二磷酸（GDP）与活性状态的鸟苷三磷酸（GTP）之间相互转换，GTP是一种结合状态，进而调控下游细胞过程。资料来源：[维基百科：G蛋白](https://zh.wikipedia.org/wiki/G_protein)
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