A) TCR-tg T cells representing the CD4-d (4C), CD4-i (TCR75) and CD8-d (2C) pathways of alloantigen recognition were purified by magnetic bead isolation and tested for purity by TCR-Vβ transgene expression and CD4 or CD8 expression using FACS analysis. B) Schematic of T cell purification, labeling with intravital dye (CFSE), and intravenous adoptive transfer into a syngeneic host. C) After transplantation, TCR-tg T cells could be identified amongst host T cells by the congenic cell surface markers, Ly5.1 and Thy1.1.