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Hydrogen/deuterium (H/D) exchange of ribosomal protein L11 in intact ribosomes. ESI mass spectra of 50S subunits in H2O (solid trace) and after 6 hr of exchange in D2O (dotted trace). m/z values for the +9 charge state of L11 are shown in both traces, indicating the increase in mass resulting from chemical exchange of protons for deuterons. Deuterons have been incorporated in an average of 154 of 244 exchangeable sites, indicating that 90 sites are protected from exchange.
