Acute Disease 4 Adult 4 Aged 4 Ammonia-Lyases 4 Chronic Disease 4 Comparative Study 4 Enzyme Tests 4 Erythrocytes 4 Female 4 Human 4 Hydroxymethylbilane Synthase 4 Kinetics 4 Male 4 Pedigree 4 Porphyria 4 blood and hemopoietic system 4 erythrocyte 4 methodology 4 porphyria 4 uroporphyrinogen synthase 4