Adenosine, a #biochemical that is found in cells and is essential for many processes. Adenosine is made up of an adenine nitrogenous base linked to a #ribose sugar #molecule. It is involved in the #biosynthesis and #replication of #DNA and #RNA, and is also a component of an #enzyme called S-adenosyl-L-methionine (SAM) and cyano-cobalamin (vitamin B-12). #Adenosine was once thought to only modify #cardiovascular #physiology, but now it is known to have many other effects on physiology.