The probes are made up of two components: a fluorogen-activating protein (FAP) and a non-fluorescent dye called a fluorogen.
这种探针由一种荧光团激活蛋白质（FAP）和一种叫荧光团的非荧光染料组成。
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When the researchers introduced its associated membrane-impermeant fluorogen, it bound to the FAP-tagged GPCR on the cell surface, emitting a bright fluorescent glow.