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Bacterial and human histamine receptors. (A) Shown is the ligand-binding domain of the TlpQ chemoreceptor from P. aeruginosa PAO1 (PDB ID 6FU4), the human histamine H1 receptor (PDB ID 7DFL) and the human β3 GABAA receptor (PDB ID 7A5V). Bound histamine is shown in stick mode in the lower part of the figure. These structures have been published in [23,69,70]. (B) Zoom on the histamine binding sites of the receptors shown above.
