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(A) X-ray crystallographic structure of homo-dimeric PDB: 2PRG (full agonist). (B) X-ray crystallographic structure of homo-dimeric PDB: 2Q6R (partial agonist). (C) X-ray crystallographic structure of homo-dimeric PDB: 2I4Z (partial agonist). (D) X-ray crystallographic structure of homo-dimeric PDB: 2Q5S (partial agonist).
