Structural aspects of allorecognition.

The phenomenon of T-cell allorecognition of foreign major histocompatibility molecules has been one of the more enigmatic aspects of T-cell immunology. The molecular basis for allorecognition is unfolding as a result of the application of major histocompatibility complex structure/function analyses in the light of current insights into the three-dimensional structure of major histocompatibility complex products.