Skip to main content
. 2008 Jul 2;3(7):e2568. doi: 10.1371/journal.pone.0002568

Figure 7. N-terminal modification of TGFβ1 by SF.

Figure 7

MS/MS spectra of m/z 768.7 representing the unmodified N-terminal peptide of TGFβ1 at retention time 23.43 min (A) and m/z 877.2 representing a modified form of TGFβ1 seen only in SF treated samples at retention time 30.85 minutes (B). Note that the y ion series remains the same while the b ion series shifts (Δ) indicating an N-terminal modification of mass 217±0.8 Da. Figure S2 provides an explanation of the mass addition of 217, as opposed to 177.