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After i.v. injection of heparin (1.6 IU/g b.w.) there was a significant increase of the diamine oxidase (DAO) activity in lymph and blood plasma in rat, guinea‐pig and rabbit. The ratio between lymph and plasma DAO activity was higher in rat and rabbit than in guinea‐pig under basal conditions. This difference was even more pronounced after heparin injection. Withdrawal of mesenteric or thoracic duct lymph from the circulation of the animals was accompanied by a poor response to heparin of the plasma DAO activity in rat and rabbit, whereas the response in the guinea‐pig seemed to be uninfluenced. These results suggest that, in analogy with earlier findings in man, the contribution from lymph to the heparin‐induced DAO response in blood plasma may be significant in the rat and rabbit, but not in the guinea‐pig.
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Hansson et al. (1971) studied this question.
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