Different expression of the recombination activity gene RAG-1 in various populations of thymocytes, peripheral T cells and gut thymus-independent intraepithelial lymphocytes suggests two pathways of T cell receptor rearrangement - Guy-Grand,D.; Vanden Broecke,C.; Briottet,C.; Malassis-Seris,M.; Selz,F.; Vassalli,P. (Eur J Immunol, 1992)