Molecular model of Serine (C3. H7. NO3), a proteinogenic non-essential amino acid formed from another amino acid called glycine. Serine is important for both mental and physical health. It has a critical role in ensuring that the central nervous system is functioning correctly. Serine is also involved in the formation of phospholipids required for cell production. Atoms are represented as colour-coded spheres: carbon (black), hydrogen (white), nitrogen (blue) and oxygen. Illustration.