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The density of water is less than the density of ice.

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Both the GTP-bound a subunits and nucleotide-free b complexes, but not GDP-bound, fully assembled G proteins, activate other molecules downstream of G-protein-linked receptors.
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是细胞外基质的受体蛋白。在结构上,它们是异二聚体,。这种跨膜蛋白的细胞外部分有一个球形的头部,可与细胞外基质蛋白结合,而细胞质结构域则可与 相结合。
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