Spontaneous Tumors in Nude Mice: Effect of the Viable Yellow Gene

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Abstract
The incidence and type of spontaneous tumors in athymic nude (nu/nu) mice (partially inbred in CBA/H background) which were also carrying the viable yellow gene (Avy, derived from C57BL/6JAvy mice), were comparable to those observed in the phenotypically normal nu/+ and +/+ control crosses carrying the Avy gene. The Avy gene increases the incidence of spontaneous and induced tumors in most mouse strains. These results would argue against the thymus dependency of the putative immunological surveillance mechanisms.