1. Quantitative methods for analysis of free amino acids in plasma have been performed on blood from normal and leukemic individuals.
2. An increase in the glutamic acid phenylalanine and "leucine" levels was found in the blood plasma of patients with acute leukemia.
3. Both the chronic myelogenous and the chronic lymphatic leukemia patients had high levels of glutamic acid, phenylalanine, alanine and proline.
4. Lower than normal levels of asparagine and threonine were found in the plasma of patients with acute leukemia.