Phosphopeptides and phosphorylated amino acids in different REF and SRPP members. The changed pattern of different protein spots after the D24, D48, E24, and E48 treatments on the DIGE gels, phosphorylated peptides, phosphorylated amino acid sites, and the predicted 3-D structures for REF/SRPP family members REF138 (A), REF175 (B), SRPP204 (C), and REF258 (Figure S2) are highlighted. The capital letters and circles with different color represent the phosphorylated amino acids in different protein spots. The detail information for these peptides and phosphorylated amino acid sites is listed in Figure S3 and Table S2.