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Fig. 6. Molecular models of binding site II in mouse leptin. (A) Molecular surface map of leptin, coloured according to surface hydrophobicity (blue, hydrophilic; green, hydrophobic). A hydrophobic cleft is formed by residues L13, L86, L89 and F92. (B) Residues in binding site II that affect binding to CRH2 are coloured yellow. Residues in binding site II that affect both binding to CRH2 and LR activation are coloured orange. (C) Residues that become buried in the leptin/CRH2 interface, coloured according to the area that becomes buried (cyan, <25 Å2; blue, 25-50 Å2; green, >50 Å2).