the following findings are reported : the highest levels of alanine , valine , glycine , isoleucine , histidine , leucine , threonine , serine , phenylalanine , tyrosine and lysine are found in the thyroid gland , methionine and aspartic acid in the spinal cord , tryptophan and hydroxyproline in the pineal gland , and proline and glutamic acid in the thymus gland .
C0020388
hydroxyproline
C0033382
proline