Driving stem cells towards a specific lineage or fate is one of the most cutting-edge aspects of stem cell research. New derivations are continually be discovered. The tools used to accomplish differentiation vary, depending on the nature of the starting stem cell population - stem cell type, species, etc. and range from culture media to cytokines, the a myriad of signaling peptides. This section lists a hundreds of products necessary for stem cell differentiation to a number of lineages. The products listed in this section are our most commonly used. Other, more unique products may also be found throughout the Sigma-Aldrich website.