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heteroantiserum

(hĕt′ə-rō-ăntĭ-sîr′əm)
n.
  1. An antiserum developed in one animal species against antigens or cells of another 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.