Correction: The Extracellular Loop 2 (ECL2) of the Human Histamine H4 Receptor Substantially Contributes to Ligand Binding and Constitutive Activity

The PDF version of Fig. 2 is incorrect. The online version of Fig. 2 is correct, and the authors have also provided a corrected version here.

Fig 2. Structures of the investigated H4R ligands.