Disclosed herein are methods of identifying one or more differentiation factors that are useful for differentiating cells in a cell population comprising definitive endoderm cells into cells which are capable of forming tissues and/or organs that are derived from the gut tube.

 
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> 2-methylene-19-nor-(20S)-1.alpha.-hydroxy-trishomopregnacalciferol

> Powder aerosolization apparatus and method

~ 00523