noun. An amino acid, C₆H₁₄N₄O₂, obtained from the hydrolysis or digestion of plant and animal protein.

noun. An amino acid found in animal foods that plays an important role in several physiological processes.

noun. a bitter tasting amino acid found in proteins and necessary for nutrition; its absence from the diet leads to a reduced production of spermatozoa

"In this research, arginine is given in pill form to determine if it can reduce or prevent symptoms in people with sickle cell disease."

essential amino acid  

asparagine  biotin  chlorodinitrobenzene  choline  citrulline  

Arg