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LC-MS/MS spectra of peptides from near the N terminus (A) and C terminus (B) of PsbA (D1) that was 15N-labeled for 1 h (panel 1) and of PsbC (CP43) that was 15N-labeled for 9 h (panel 2) in PSI-less cells. The insets show controls that were labeled for 0 h. All peptides were detected as doubly charged (z = 2) molecules.
