Solubilized basement membrane preparation extracted from the Engelbreth-Holm-Swarm (EHS) mouse sarcoma. Corning™ Matrigel™ Growth Factor Reduced (GFR) Basement Membrane Matrix, Phenol Red-Free, LDEV-Free is tumor rich in extracellular matrix proteins, including Laminin (a major component), Collagen IV, heparin sulfate proteoglycans, entactin/nidogen, and a number of growth factors.