FWIW, the interests of a couple of Teva's expert witnesses. Can't tell from the record if their declarations were stricken or not:
"Biologically significant protein binding occurs with a group of polyelectrolytes known as glycosaminoglycans (GAGs). These mammalian polysaccharides are the most highly charged macromolecules in animals. Although they play a role in the action of many signaling proteins responsible for tissue regeneration, angiogenesis and cell differentiation, structure-property relations for GAGs are unknown. Unlike proteins and nucleic acids, they are never homogeneous and therefore never “pure,” so their characterization presents a huge challenge to classical biochemistry. We approach this problem with the model GAG-protein system of heparin-antithrombin, applying electrophoretic methods coupled with mass spectrometry and protein modeling."