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American physician-scientist Simon Flexner (1863-1946), c1905

(Photograph by Elias Goldensky, Philadelphia. Source: The World's Work: A History of Our Time. New York: Doubleday, Page & Company, 1904;9[2]:5550.)

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  • asplenia
  • deficiency of a terminal complement component (C5-9)
  • deficiency of properdin