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American Zoologist 1975 15(1):39-49; doi:10.1093/icb/15.1.39
© 1975 by The Society for Integrative and Comparative Biology
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In Search of the Hagfish Thymus

HOLLISTON B. RIVIERE, EDWIN L. COOPER, A. L. REDDY and WILLIAM H. HILDEMANN
Department of Anatomy and Department of Medical Microbiology and Immunology, School of Medicine, University of California Los Angeles, California 90024

The Pacific hagfish, Eptatretus stoutii, is capable of a variety of immunologic responses including allograft rejection and serum antibody production to soluble and cellular antigens. Interest has revived in the morphology of hagfish lymphoid tissues. The search for a thymus in young specimens has resulted in the discovery of a phagocytic and antigen-receptive cell population associated with the pharyngeal velar muscles. We suggest that a protothymus or precursor of the thymus of higher vertebrates may be contained within this velar muscle complex.


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