For 10 points, name this molecule behind the "fight or flight" response, also known as epinephrine and produced in its namesake gland.
Unlike its precursor molecule, it is not psychoactive. Its synthesis from that precursor involves PNMT catalyzing the methylation of an amine group in chromaffin cells, which overproduce this molecule in pheo-chromo-cytomas.  Its binding to alpha receptors results in contraction of smooth muscle, while its binding to beta receptors can result in lypolysis and smooth muscle relaxation, especially in arteries leading to lungs and skeletal muscles. For 10 points, name this molecule behind the "fight or flight" response, also known as epinephrine and produced in its namesake gland.
Unlike its precursor molecule, it is not psychoactive. Its synthesis from that precursor involves PNMT catalyzing the methylation of an amine group in chromaffin cells, which overproduce this molecule in pheo-chromo-cytomas.  
{adrenaline} [accept {epinephrine} before it's read]