Definition of Serine

1. Food Portion Distortion Quiz: Test Your Diet IQ
2. Food Frauds That Wreck Your Diet Slideshow
3. Foods That Help or Harm Your Sleep Slideshow

Serine: An amino acid, one of the 20 building blocks of protein. A dietary nonessential amino acid, serine is present in many proteins participates in the synthesis of purines and pyrimidines, and is in the active sites of many enzymes. Symbol: Ser.