Corning Matrigel Matrix Phenol Red-free, *LDEV-free, 10 mL, is recommended for assays that require color detection (e.g. fluorescence). Corning Matrigel matrix is a solubilized basement membrane preparation extracted from the Engelbreth-Holm-Swarm (EHS) mouse sarcoma, a tumor rich in extracellular matrix (ECM) proteins, including Laminin (a major component), Collagen IV, heparan sulfate proteoglycans, entactin/nidogen, and a number of growth factors.