<immunology, molecular biology> A site on an MHC Class I or Class II antigen (see histocompatibility antigen) recognised by a T-cell. ... (18 Nov 1997) ... 
A site on an MHC Class I or Class II antigen (see histocompatibility antigen) recognized by a T-cell.
Type: Term Pronunciation: his′tō-tōp Definitions: 1. That part of the Class II major histocompatibility molecule that interacts with the T cell receptor.