Seeing purple.
Reuben
Adrian
A
Division of GI/Hepatology, Department of Medicine, Medical University of South Carolina, USA.
D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008512:Medicine in the Arts; D011164:Porphyrias / Q000266:history*; D011166:Porphyrins / Q000266:history*
D011166:Porphyrins