The reactions of sipunculid worms to auto and homo coelomic transplants of tentacles were investigated. These transplants were found to be encapsulated by host hemocytes in the coelomic fluid at rates independent of their origins. No enhancement of phagocytic numbers or encapsulation rate was observed in second series transplants. No antibody production could be demonstrated following the injection of cellular or protein antigens.
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Triplett et al. (1958) studied this question.