FASTCell™ Mera-Keratins is a line of products that makes use of human keratin biomaterials, which can be used in place of tissue culture coatings such as collagen or basement membrane extract. Available as a lyophilized powder for reconstitution as a coating material, the Mera-Keratin product line is purified, sterile, and free of any animal materials. Meta-Keratins contain structural features such as binding domains that are recognized by integrin receptors to promote cell surface attachment. There are four preparations of human keratin: Meta-Keratin I, II, III, and IV, each of which differs subtly in its capacity to emulate the extracellular matrix and promote growth, differentiation, and function in various cell types.