| 3DSZ: reference: High-affinity recognition of lanthanide(III) chelate complexes by a reprogrammed human lipocalin 2., Kim HJ, Eichinger A, Skerra A, J Am Chem Soc. 2009 Mar 18;131(10):3565-76. PMID: 19227970 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).