Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1756-9966-31-56/MediaObjects/13046_2012_Article_596_Fig1_HTML.jpg)
Exemplary LC/MS results. LC/MS results of the calibration standard with CP-AP concentration of 0.4 μmol/L (A) Extracted ion chromatogram (XIC) of CP-AP with extracted mass of 515.795 +/−0.005. The peak area of the respective m/z 515.795 is filled in grey and was used for quantification. (B) ESI mass spectrum of the anchor peptide eluting at 15 +/− 1 min.