and ( iv ) different types of thymic epithelial cells play an essential role in the differentiation of pro-t cells into either l3t4+ tcr alpha , beta+ l3t4-lyt2- tcr alpha , beta+ or l3t4+lyt2+ and lyt2+ tcr alpha , beta+ cells in vitro .
C0085247
tcr alpha , beta
C0087048
tcr