This document provides materials and methods for treating a damaged optic nerve in a mammal to restore visual function comprising administering a population of induced pluripotent stem cell-derived oligodendrocyte precursor cells. This document also provides materials and methods for determining a remyelination potential quotient of a population of induced pluripotent stem cell-derived oligodendrocyte precursor cells. This document also provides materials and methods for screening factors that enhance maturation or myelination efficiency of an induced pluripotent stem cell-derived oligodendrocyte precursor cell or cells.
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