A study of caffeine in tea.
D002110:Caffeine / Q000032:analysis*; D008722:Methods; D013662:Tea / Q000032:analysis*; D013805:Theobromine / Q000032:analysis; D013806:Theophylline / Q000032:analysis
D013662:Tea; D002110:Caffeine; D013806:Theophylline; D013805:Theobromine