* Acellular Dermis. An acellular dermis is made by removing the cells (epidermis and dermal fibroblasts) from split-thickness skin. It has two sides: one side has a basal lamina suitable for the epithelial cells, and the other is suitable for fibroblast infiltration because it has intact vessel channels. It is durable, able to keep its structure and does not trigger immune reactions (non-immunogenic).
* Amniotic Membrane. The amniotic membrane, the inner part of the placenta, has a thick basement membrane of collagen type IV and laminin and avascular connective tissue.