Vampires: when fantasy meets reality.
D005260:Female; D006418:Heme / Q000096:biosynthesis; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008093:Literature, Modern; D008297:Male; D009229:Mythology; D011164:Porphyrias
D006418:Heme