<unk>  is a catabolic product of guanosine triphosphate (GTP), a purine nucleotide.<unk>  belongs to the chemical group known as pteridines. It is synthesised by human macrophages upon stimulation with the cytokine interferon-gamma and is indicative of a pro-inflammatory immune status.<unk>  serves as a marker of cellular immune system activation.
Neopterin
Tetrahydrobiopterin
Hemoglobin
Fosdenopterin
Lipochrome
Phosmet
Gamma globulin
Hematoporphyrin