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Phosphorylation site are shown in red stick models. A: p21/PCNA complex (PDBID: 1AXC, chain A, B). p21 (colored in yellow) forms an ordered conformation upon binding to PCNA (green). B: RhoGDI-Rac1 complex (PDBID: 1HH4, chain B, E). RhoGDI has a C-terminal domain (shown in cyan) and a flexible N-terminal region (yellow) which become ordered upon binding to Rac1 (pink).
