title: Pterin-6-aldehyde production from folic acid by malignant tissues.
mesh_terms: D004912:Erythrocytes / Q000201:enzymology; D005492:Folic Acid / Q000378:metabolism*; D006801:Humans; D009369:Neoplasms / Q000378:metabolism* / Q000652:urine; D011621:Pteridines / Q000096:biosynthesis* / Q000652:urine; D011622:Pterins
chemical_list: D011621:Pteridines; D011622:Pterins; C005926:2-amino-4-hydroxy-6-formylpteridine; D005492:Folic Acid