title: Plasma tryptophan binding and depression.
mesh_terms: D003863:Depression / Q000097:blood* / Q000188:drug therapy; D005260:Female; D006801:Humans; D008094:Lithium / Q000627:therapeutic use; D008875:Middle Aged; D011485:Protein Binding; D014364:Tryptophan / Q000097:blood*
chemical_list: D014364:Tryptophan; D008094:Lithium