PCQAP / MED15 is a member of the mediator complex that can act as both a positive and negative regulator of transcription. The mediator complex interacts with RNA pol II and its associated proteins, the general transcription factors. Mediator proteins serve as a bridge connecting the activator and basal transcription machinery.Shipped at 4°C. Store at 4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C long term. Avoid freeze / thaw cycle. *   http://www.creative-diagnostics.com/Anti-MED15-PAb-204349-147.htm