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Tumor formation suppressed in gammadeltaT knock-out mice.

Tumor formation was examined in mice in which the beta-chain gene of alphabetaT was knocked out (alphabetaT-KO mice) or the delta-chain gene of gammadeltaT was knocked out (gammadeltaT-KO mice). Development of Hepa 1-6 cell hepatoma was observed in six of six alphabetaT-KO mice, in four of six wild-type mice, and in only one of six gammadeltaT-KO mice. These results imply that gammadeltaT cells play a role in suppression of killer cell activity in tumor-bearing mice.