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. 2001 Jul 16;20(14):3789–3799. doi: 10.1093/emboj/20.14.3789

graphic file with name cde368f5.jpg

Fig. 5. CPK presentation of the environment of the phosphorylatable histidines in PRD1 (A) and of the mutated aspartates in PRD2 (B). These are surrounded by conserved hydrophobic residues that probably constitute the interacting surface for (de)phosphorylating partners.