A rat antigen system parallel to the mouse theta system has been described• All rat strains tested expressed an antigen cross-reactive with the θ-AKR specificity of mice while none cross-reacted strongly with θ-C3H. The rat antigen may be demonstrated by either absorption or direct complement-mediated killing of rat thymocytes. Patterns of organ distribution and developmental appearance in the nervous system of rats also parallel those previously reported for theta in mice.
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