title: TLC of porphyrins.
mesh_terms: D002855:Chromatography, Thin Layer; D004952:Esters / Q000652:urine; D005243:Feces; D006801:Humans; D008403:Mass Screening; D008722:Methods; D011166:Porphyrins / Q000302:isolation & purification / Q000652:urine*; D013048:Specimen Handling; D013627:Talc
chemical_list: D004952:Esters; D011166:Porphyrins; D013627:Talc