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(a) 21, (b) 23, (c) 62, (d) 29, (e) 47 and (f) 54 inthe MT2receptor (purple). The center panel shows a canonical 7-TM receptor structure of MT2 receptor (blue helices; part of TM-V is not displayed for clarity) in complex with 2-phenylmelatonin shown as green spheres (PDB id: 6ME6).
