Definition of "isoleucine" [isoleucine]

• An essential amino acid, C6H13NO2, that is isomeric with leucine. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "THURSDAY, Feb. 18 (HealthDay News) -- An amino acid called isoleucine may play an important role in weight loss, a new study suggests."
• "The amino acids are arginine, histidine, isoleucine, lysine and methionine."
• "Retention of initial stereochemical codon assignments for three of six amino acids (arginine, isoleucine, and tyrosine, but not glutamine, leucine or phenylalanine) is strongly supported."