<p><b>Copyright information:</b></p><p>Taken from "Distantly related lipocalins share two conserved clusters of hydrophobic residues: use in homology modeling"</p><p>http://www.biomedcentral.com/1472-6807/8/1</p><p>BMC Structural Biology 2008;8():1-1.</p><p>Published online 11 Jan 2008</p><p>PMCID:PMC2254393.</p><p></p>te) and β in gray. The numbering of 1QFT refers to that of Figure 1. Positions at the extremities of the secondary structure elements are numbered to facilitate the reading. Residues interacting with histamine in the structures of 1QFT are underlined. Those belonging to the H site are bold. Boxes indicate examples of realigned regions