title: Isolation and preparation of pterins from biological materials.
mesh_terms: D000818:Animals; D001001:Anura; D001708:Biopterins / Q000031:analogs & derivatives / Q000302:isolation & purification; D002852:Chromatography, Ion Exchange / Q000379:methods; D019798:Neopterin; D010084:Oxidation-Reduction; D011621:Pteridines / Q000302:isolation & purification; D011622:Pterins / Q000302:isolation & purification*; D011892:Rana catesbeiana; D012867:Skin / Q000032:analysis
chemical_list: D011621:Pteridines; D011622:Pterins; D001708:Biopterins; D019798:Neopterin; C016727:sepiapterin