Update publication information. For phophoproteomics, the nosGal4>w- (control) samples 1, 2, and 3 were labeled with iTRAQ tags 118, 119, and 121, respectively. Samples of nosGal4>ocn-hp 1, 2, and 3 were labeled with iTRAQ tags 115, 116, and 117, respectively. The labeled peptides were desalted and concentrated in Sep-Pack C18 Cartridges (Waters, Milford, MA, USA). Then, iTRAQ-labeled peptides were added into the freshly prepared TiO2 beads at peptides-to-beads ratio of 1 : 4 for phosphopeptide enrichment. The peptide-beads’ slurry was shaken on a rotator at 37 °C for 1 h and then centrifuged for 30 s and then washed. Phosphopeptides were finally eluted with elution buffer for further analysis.