Fig. 6From: Targeted quantitation of CFTR protein expression in vivo using immunoprecipitation & parallel reaction monitoring tandem mass spectrometryStandard curve of hCFTR by plotting peak area ratio of light to heavy peptide LSLVPDSEQGEAILPR in mouse lung membrane protein extracts. Streptavidin magnetic beads and biotinylated anti-CFTR antibody were used for IP. hCFTR concentration was 0.5, 1.4, 4.1, 12, 37, to 111 pg per mg tissue for standard 1 to 6, respectively. Calibration curve in linear regression with weighting 1/X was plotted by using Xcalibur softwareBack to article page