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The lipocalin fold. Members of the lipocalin family have a typical eight-stranded, anti-parallel, symmetrical β-barrel fold structure. Depicted are human and mouse LCN2, human retniol-binding protein 4 (RBP4), and human liver fatty acid-binding protein (L-FABP). The depicted structures were generated using the Ribbons XP software (version 3.0) and coordinates 3BX8, 3S26, 3FMZ, and 2LKK deposited in the RCSB Protein Data Bank (http://www.rcsb.org). A size marker (10 Å) is given.
