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Cartoon representation of 3D model for CXCR4 receptor. Intramolecular hydrophobic interactions represented as three aromatic clusters are also shown: 1) cluster among TMs I, II and VII; 2) cluster among TMs II, III and IV; and 3) cluster among TMs VI and VII. (A) Side view. (B) Top view from the intracellular side (without loops and Nter for clear visual of TMs).
