Thymic T cells are driven to expand upon interaction with self-class II major histocompatibility complex gene products on accessory cells.
Rock KL, Benacerraf B. Thymic T cells are driven to expand upon interaction with self-class II major histocompatibility complex gene products on accessory cells. Proc Natl Acad Sci U S A. 1984 Feb; 81(4):1221-4.