Iterative Synthetically Phosphorylated Isomers (iSPI) is a proteome-scale library of human-derived phosphoserine-containing phosphopeptides with precisely known positions of phosphorylation. This multi-purpose resource is available for optimization, standardization, and benchmarking of key steps in phosphoproteomics workflows.
- Brandon M. Gassaway
- Jiaming Li
- Steven P. Gygi