Then the sulfur group breaks off and the ring rearranges to incorporate the new nitrogen two spots over ... researchers could pinpoint what parts of the structure are responsible and then make ...

Asteroids, small airless bodies within the inner solar system, are theorized to have contributed water and chemical building ...

This image depicts the chemical structure of cytosine. It shows a hexagonal ring with nitrogen atoms at positions 1 and 3, and a primary amine group attached to carbon 4. The two remaining positions ...