Figure 1A.

Variations between technical replicates were generally small with a Pearson correlation value >0.9. Between duplicate runs, serum protein levels of IGFALS measured by peptide LHSLHLEGSCLGR were consistent. 1B. Multiple peptides (or features) derived from the same protein performed consistently in most SRM tests. As shown here, A1BG serum levels measured by the three features SGLSTGWTQLSK and HQFLLTGDTQGR precursor charge 2 and 3 were in close agreement. Relative protein levels in blood are indicated by light/heavy peptide ratios.