Fig. 2. (a) HDGF phosphopeptide sequence with b- and y-ion assignments observed in MS/MS spectrum. A series of y-ions (y10–y14) containing the phosphate group. (b) The MS/MS spectrum of the HDGF phosphopeptide. The arrows indicate the ions containing the phosphate group. The observed m/z is 607.62 with charge of 3+ which corresponds to the HDGF phosphopeptide peak.
