title: A simple method to determine nanogram levels of 4-hydroxyproline in biological tissues.
mesh_terms: D000818:Animals; D002863:Chromogenic Compounds; D006868:Hydrolysis; D006909:Hydroxyproline / Q000032:analysis*; D008168:Lung / Q000032:analysis*; D008832:Microchemistry; D011758:Pyrroles / Q000032:analysis; D051381:Rats; D013053:Spectrophotometry; D013696:Temperature
chemical_list: D002863:Chromogenic Compounds; D011758:Pyrroles; D006909:Hydroxyproline