Stem cells promise much in the way of developmental research, clinical therapeutics and drug screening. In order to get a clear understanding of the genetic, epigenetic, proteomic, and post-translational characteristics of stem cells. The nuclear and cytoplasmic signaling events and cascades and their resulting phenotypes are still much of a mystery, particularly when speaking of DNA and/or RNA modifications are applied. The products in this section are a sampling of the tools necessary for accurate functional profiling of stem cells. The products listed in this section are our most commonly used. Other, more unique products may also be found throughout the Sigma-Aldrich website.