Fig. 8

Tandem mass spectrum of the light chain tryptic peptide carrying the site-specific mutation. a IgG light chain tryptic peptide with tyrosine at position 173 and b IgG_pAzF light chain tryptic peptide with pAzF at position 173 (mass increment of 25 Da). All ⁺¹y and ⁺¹b ions are listed above the corresponding sequence in the upper right corner