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isocytolysin

(ī′sō-sī-tŏlĭ-sĭn)
n.
  1. A cytolysin that reacts with the cells of certain other animals of the same species, but not with the cells of the individual that formed it.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.