| Protein tyrosine kinases play fundamental roles in signal transduction pathways. |
| The synthesis of these hormones requires the amino acid tyrosine and the trace mineral iodine. |
| The amino acids glutamine and tyrosine will improve concentration, retention and a sense of alertness. |
| Coupled with tyrosine, the caffeine in guarana helps promote muscle performance and neurotransmitter regeneration. |
| Indeed, some seed diets fed to cage birds are known to be protein deficient and specifically deficient in tyrosine, cysteine, or methionine. |
| The most prevalent amino acid is cysteine with other major ones including tyrosine, histidine, lysine and arginine. |
