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Background:The peripheral light-harvesting complexes of photosystem II (LHCII) switch between light energy capturing and dissipative states. Results: An NMR analysis is presented of the arginines in LHCII prepared in its two states. Conclusion:The protein core of arginine-glutamate interlocked helices is preserved, whereas moderate changes occur in the stromal loop region. Significance: This work reveals consequences for the molecular switching of LHCII.

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