信号识别颗粒[1](英语:Signal recognition particle,简称为SRP)是一种存在于胞质溶胶中大量、普遍存在且进化保守的核糖核蛋白(蛋白质-RNA复合体),它可以识别特定的蛋白质,并将它们对准投放到真核细胞的内质网/原核生物的质膜上。
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