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ectoantigen

(ĕk′tō-ăntĭ-jən)
n.
  1. A toxin or other inducer of antibody formation, separate or separable from its source.exoantigen
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.