While the bimane label at site 243 does show a small amount of quenching by the R175E mutant in Figure 4 b, which might reflect some slight quenching by Y67 on arrestin, the difference is not clearly significant.
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Rhodopsin TM6 can interact with two separate and distinct sites on arrestin: evidence for structural plasticity and multiple docking modes in arrestin-rhodopsin binding.
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