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NMR titration analysis reveals that SCR1 and SCR2 of CR2 are both involved in ligating gp350. Two superimposed 1H-15N TROSY-HSQC spectra of 15N-labeled CR2 SCR1–2 (0.6 mm in ⅓× PBS) were collected during titration with increasing amounts of gp350. Black, no gp350; red, saturating amounts of gp350. Inset, detailed view of chemical shift change. The numbering scheme used here for CR2 is based on the amino acid sequence for the mature protein.
