NEW -> Animal-Free Choices! Where indicated, Animal-Free recombinant proteins are made using non-mammalian system components and processes, which researchers often select for stem cell cultures, serum-free applications, chemically-defined media and other in vitro pre-clinical work. These lab workers must reduce or eliminate altogether any risks of contaminating growth factors, viruses, prions and animal-derived ingredients. Our animal-free proteins are manufactured using an E.coli-based system, an animal-free facility, fermenter, columns, filters, labware, lyophilization and storage, and NO FBS or animal-derived ingredients. Quality standards include endotoxin levels <1.0 EU/ug protein, purity levels ³ 95% and bioactivity comparable to recombinant protein produced in traditional techniques.