This Type IV Collagen is isolated from human placenta and is purified using a multi-step process. The product is supplied as a sterile, lyophilized powder containing 5 mg of Type IV collagen per vial. Type IV Collagen is the primary collagen found in the extracellular basement membranes separating a variety of epithelial and endothelial cells. It is a major component of the dermal-epidermal junction where it is mostly found in the lamina densa. It is a heterotrimeric molecule containing two Alpha 1-like and one Alpha 2-like chains. Type IV Collagen is typically used as a thin coating on tissue culture surfaces. Specific instructions are found in the Directions for Use. This product is generally used in vitro as a substrate scaffold to enhance cell attachment, adherence and proliferation. Type IV collagen may be used to culture epithelial, endothelial, muscle, nerve and many other cell types.