tryptophan metabolites through kynurenine pathway and 5-hydroxytryptophan pathway in the synovial fluid , blood and urine of patients with rheumatoid arthritis and those with osteoarthritis were investigated in order to know the specificity of the tryptophan metabolism , especially the role of serotonin in the joint diseases .
C0041249
tryptophan
C0000578
5-hydroxytryptophan