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In a recent MAS NMR study, two types of histidine residues in the light-harvesting complex II (LH2) of Rhodopseudomonas acidophila were resolved: Type 1 (neutral) and Type 2 (positively charged) (Alia et al. J. Am. Chem. Soc.). The isotropic 13C shifts of histidines coordinating to B850 BChl a are similar to fully positively charged histidine, while the 15N shift anisotropy shows a predominantly neutral...
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