Abstract: The present invention provides a method for producing a cell sheet, including (1) a step of preparing mammal-derived cells, and (2) a step of seeding the prepared cells on a plane substrate in high density, and culturing the cells, a cell sheet produced by the method, a material for transplantation, Bruch's membrane and the like.

Abstract: The present invention provides a method of producing primate retinal progenitor cells, comprising culturing primate embryonic stem cells as suspended aggregates in a serum-free medium, and obtaining retinal progenitor cells from the culture. The present invention further provides a method of producing photoreceptor precursor cells, comprising culturing isolated retinal progenitor cells differentiated from embryonic stem cells, under adhesive conditions, in the presence of a gamma secretase inhibitor, and obtaining a photoreceptor precursor from the culture.

Abstract: Wnt3a proteins represented by SEQ ID NO:2, etc. are used as the active ingredient of remedy for nerve cell regeneration, in particular, remedy for retinal cell regeneration which is useful in treating retinitis pigmentosa, age-related macular degeneration, cone dystrophy and so on.

Abstract: A method of producing a lens cell is disclosed. The method includes: an ES cell maintenance step of maintaining an ES cell by using a medium containing a fibroblast growth factor FGF-2 at a concentration of 2 ng/ml to 50 ng/ml; and a differentiation inducing step, carried out after the ES cell maintenance step, of inducing differentiation of the ES cell into a lens cell by implanting and culturing the ES cell on a mouse-skull-cell PA6 at a cell density of 2 colonies/cm2 to 6.5 colonies/cm2. In one embodiment, a washing step, carried out between the ES cell maintenance step and the differentiation inducing step, of washing the maintained ES cell once with an ES differentiation medium is included.

Abstract: The present invention is directed to methods of repairing damaged or diseased, specialized or differentiated tissue in mature animals, particularly neuronal tissue such as retinas. In particular, the invention relates to transplantation of adult, hippocampus-derived progenitor cells into a selected neural tissue site of a recipient. These cells can functionally integrate into mature and immature neural tissue. The invention encompasses, in one aspect, repopulating a retina of a dystrophic animal with neurons, by injecting clonally derived, adult central nervous system derived stem cells (ACSC) derived from a healthy donor animal into an eye of the dystrophic recipient. Herein disclosed is the first successful and stable integration of clonally derived ACSC into same-species but different strain recipients (e. g., Fischer rat-derived adult hippocampal derived progenitor cells (AHPCs) into dystrophic RCS rats). Surprisingly, AHPCs were also found to integrate successfully into a xenogeneic recipient (e.g.