Cereal Chem 63:175-176 | VIEW ARTICLE NOTE: Tryptophan Levels in Normal and High-Lysine Sorghums. M. M. Hassen, E. T. Mertz, A. W. Kirleis, G. Ejeta, J. D. Axtell, and E. Villegas. Copyright 1986 by the American Association of Cereal Chemists, Inc.