lyS MICHAEL FELDMAN AND DAVID YAFFE 



Specific suppression of antibody production. The latter might be 

 a result of immunological paralysis, due to prolonged exposure 

 to a high dose of isoantigens of the hosts. However, unhke other 

 phenomena of paralysis, this one is preceded by a stage of 

 immunity (folio v^ing a shorter exposure time). Thus, the tv^o 

 mechanisms of "adaptation", of bone marrov^ and of tumour 

 cells in radiation chimeras, are still unclear. They both seem to 

 reflect results of interactions betw^een cells of different antigenic 

 constitution. 



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