Phosphoproteomic analyses of orthochromatic erythroblasts treated with DMSO or U0126. (A) Principal component analysis of the phosphoproteomics data from human orthochromatic erythroblasts treated with DMSO or U0126. (B) Top 5 upregulated GO terms of differentially phosphorylation sites. (C) Top 5 downregulated GO terms of differentially phosphorylation sites. (D) Changes in phosphorylation of molecules involved in endocytic recycling.