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Division of Animal Nutrition, University of Illinois, Urbana, Illinois
The pattern of essential amino acid requirements of the growing rat has been used as a reference "protein" for estimating the nutritive value of various proteins. A "requirement index" is proposed as a chemical estimate of the nutritive value of proteins. Its correlation with the biological value of 11 proteins is highly significant (r = 0.9654).
2 Present address: Department of Biochemistry, Indian Institute of Science, Bangalore 12, India.
Manuscript received 19 August 1963.