noun. A crystalline amino acid, C₃H₇NO₂, that is a constituent of many proteins.

noun. one of the natural amino acids found combined in the proteins of most living tissues. It can be isolated as a white crystalline base, C3H7NO2. The natural form is the L-configuration.

noun. A nonessential amino acid 2-aminopropanoic acid found in most animal proteins

noun. A specific residue, molecule, or isomer of this amino acid

noun. a crystalline amino acid that occurs in many proteins

"When alanine is produced in a laboratory under normal conditions, a mixture is obtained, half of which is (S) - alanine and the other (R) - alanine."