PorphyrinsCoproporphyrinsMetalloporphyrinsHematoporphyrinsPorphyriasUroporphyrinsProtoporphyrinsDeuteroporphyrinsAminolevulinic AcidMesoporphyrinsHemeHarderian GlandFerrochelataseHematoporphyrin DerivativePhotosensitizing AgentsPhotochemotherapyLevulinic AcidsDihematoporphyrin EtherPorphyrinogensPorphobilinogenUroporphyrinogen DecarboxylaseMolecular StructureSpectrophotometryHydroxymethylbilane SynthaseSpectrometry, Mass, Fast Atom BombardmentHeminHemeproteinsHexachlorobenzeneModels, MolecularSpectrometry, FluorescenceIron5-Aminolevulinate SynthetasePorphyria Cutanea TardaUroporphyrinogensMolecular ConformationPorphyrias, HepaticOxidation-ReductionModels, ChemicalSpectrum AnalysisElectronsMagnetic Resonance SpectroscopyMyoglobinProtoporphyrinogen OxidaseDicarbethoxydihydrocollidineKineticsCobaltCrystallography, X-RaySpectrophotometry, UltravioletPorphobilinogen SynthaseSpectrum Analysis, RamanManganesePhotochemistryChromatography, High Pressure LiquidBinding SitesHematoporphyrin PhotoradiationGold CompoundsStructure-Activity RelationshipProtein ConformationHydrogen BondingFullerenesPeroxidasesOxygenLyasesGriseofulvinCatalysis