Abstract: A biological tissue sheet which is expected as exerting a favorable therapeutic effect and a high safety in transplantation. The biological tissue sheet formed by (a) preparing in vivo-derived cells; (b) sowing the in vivo-derived cells on amniotic membrane; and (c) culturing and proliferating the in vivo-derived cells in the absence of any xenogeneic animal cells. As the cells of a biological origin, for example, cells originating in corneal epithelium, conjunctival epithelium, skin epidermis, hair follicle epithelium, oral mucosa, respiratory tract mucosa, or intestinal tract mucosa.

Abstract: A corneal epithelial sheet having potential for the achievement of a favorable therapeutic effect and being highly safe in transplantation. The corneal epithelial sheet is constructed by: (a) preparing corneal epithelial cells; (b) separately culturing human fibroblasts in a collagen gel; (c) sowing or placing the corneal epithelial cells on the collagen gel; and (d) culturing and proliferating the corneal epithelial cells in the absence of xenogeneic animal cells.