Fig. 7From: The calcified eggshell matrix proteome of a songbird, the zebra finch (Taeniopygia guttata)Phosphopeptide spectrum of a protein similar to PEDF. The doubly charged peptide has a mass error of 4.35Â ppm and a PEP of 0.0003. Y-ions are shown in red, b-ions in blue, and fragments with neutral loss of ammonia or water are in orange. Asterisks indicate loss of the phospho groupBack to article page