Immunological tolerance: new approaches using transgenic mice.

Transgenic technology allows the introduction into the germline of an animal of a known gene coding for a normally foreign antigen, and by means of a specific promoter, the direction of its expression to specific tissues. The antigen is therefore synthesized by the animal as an authentic self molecule, at a particular stage in development, and in a particular site. In this review, J.F.A.P. Miller and colleagues discuss this radically new approach to the investigation of the mechanism of acquired immunological tolerance to self components.