beta-lactoglobulin

Found in milk, bovine β-lactoglobulin is a commercially important whey protein of nutritional value. This is a model of β-lactoglobulin with a fatty acid, palmitate, bound.

"β-Lactoglobulin is the major whey protein of cow and sheep's milk (~3 g/l), and is also present in many other mammalian species; a notable exception being humans. Its structure, properties and biological role have been reviewed many times."
--https://en.wikipedia.org/wiki/Beta-lactoglobulin

One STL file contains a representation of the protein in cartoon form with residues binding the palmitate group represented as spheres (in blue in the images). A separate STL file contains the palmitate group itself (in green in the images). Model based on the Protein Data Bank entry 1B0O:
--http://www.pdb.org/pdb/explore/explore.do?pdbId=1b0o

Model created using VMD:
http://www.ks.uiuc.edu/Research/vmd/