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- D. C. Hoffman, F. Duran-Reynals
- J. Exp. Med.,
A factor can be extracted from testicle tissue and sperm which is very active in enhancing infections (1-3) on the one hand, and in inhibiting the growth of transplantable tumors (4) on the other. The purpose of the present work has been to study the effects on this factor of sera from animals experimentally immunized to testicle extract, in order to gain further information as to the nature of the latter.