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Binding modes of compounds 4a (lime) and 4b (light teal) in the MOR binding site (yellow). The ligands are shown as colored sticks. Several residues and transmembrane helices (relevant for each picture) are shown and labelled. Yellow dotted lines represent interactions. (A) Both compounds superimposed on DAMGO (pink, from 6DDF [43]). (B,C) Focus on the on the interactions of the C-terminal part, showing compounds 4a (B) and 4b (C).
