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autoisolysin

(ô′tō-ī-sŏlĭ-sĭn, -ī′sō-lī-)
n.
  1. An antibody that with complement causes lysis of cells in the organism in whose body the lysin is formed, as well as in others of the same species.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.