A method of manipulating the fate of a cell, which comprises contacting the cell with at least one of (a) a cell fate-determining untranslated/noncoding RNA species (cuR), (b) a modified cuR, or (c) a compound that modifies or affects cuR, under conditions sufficient to cause a cell-changing or cell-maintaining fate that results in cell regeneration, cell differentiation or cell death, so that an increase of desirable cells or a decrease in undesirable cells can be obtained. Another aspect of the invention relates to a method of manipulating the fate of a cell by contacting the cell with a compound that affects a fate-determining mechanism involving homologous nucleic acid interactions of RNA:RNA or RNA:DNA or resolution of such interactions under conditions sufficient to cause a cell-changing or cell-maintaining fate that results in cell regeneration, cell differentiation or cell death, so that an increase of desirable cells or a decrease in undesirable cells can be obtained. The invention generates cell fate or cell maintenance in a subject, such as a human, so that an increase of desirable cells or a decrease in undesirable cells can be obtained in the subject. This feature can be applied to a therapeutic method of treating a condition in a subject.