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 rep