title: Some points on threshold effects and action spectra in porphyria cutanea tarda.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011164:Porphyrias / Q000175:diagnosis* / Q000473:pathology; D012867:Skin / Q000528:radiation effects; D012871:Skin Diseases / Q000175:diagnosis*; D014466:Ultraviolet Rays