Phosphorylated peptides identified by mass spectrometry from the leaves of wild type and <i>stn</i> mutant plants exposed to normal or high light.

The modifications in peptide sequences are indicated like: Ac-, N-terminal acetylation; low case t, phosphorylated threonine residue; low case s, phosphorylated serine residue, with superscripts indicating the numbers of phosphorylated residues in the protein sequence. All of these phosphorylated peptides, with exception of the triply phosphorylated peptide from the PsaD protein, had been sequenced earlier from the plants exposed to normal light [12], [25], [32], [37]. The phosphorylated peptides were considered as identified in the samples from the high-light-treated plants on the basis of CID or ETD sequencing data presented in Figure S1.