Removal of arg, pro, thre or tryp reduced specific binding of bGH to cultured pig hepatocytes. 2003, Wolfgang-Bernhard Souffrant, Cornelia C. Metges, Progress in Research on Energy and Protein Metabolism, page 761:
All large neutral amino acids, including tryp, showed significant postprandial increases. The ratio of total tryp to the sum of these neutral amino acids did not change in response to eating. 1975, Andrea Phyllis Boyar, The effect of undernutrition on brain serotonin and 5HIAA in the neonatal and weanling rat:
Through biochemical analysis of the tryp A protein, it was shown that each of the 16 mutants resulted in an amino acid substitution at a different position in the protein. 2002, Anthony J.F. Griffiths, Modern Genetic Analysis: Integrating Genes and Genomes, volume 1: