Plasma Levels of Free Amino Acids in Normal Subjects Compared with Patients with Rheumatoid Arthritis.

Abstract
Microbiologic detns. of plasma values for arginine, glycine, histidine, lysine, phenylalanine, serine, and threonine were detd. in a group of normal individuals and compared with the values obtained from patients with rheumatoid arthritis. The values obtained for arginine, histidine, and threonine in patients with rheumatoid arthritis were lower than those obtained from the normal group. These differences were highly significant. The values for glycine, lysine, phenylalanine and serine were not significantly different in the group with rheumatoid arthritis from those found in the group of normal individuals.