Amino Acid Imbalance of Zein: Relation to Nicotinic Acid Deficiency in the Chick.

Abstract
Studies were made with chicks on the corn-nicotinic acid relationship. By use of an amino-acid mixture simulating zein, it was found that chick-pellagra symptoms caused by the feeding of zein were due to the combined action of the amino acid constituents of this protein. Glutamic acid, leucine, alanine, pro-line, and phenylalanine, the amino acids occurring in greatest amts., seem to be principally involved in this connection.