Pre-TCRalpha and TCRalpha are not interchangeable partners of TCRbeta during T lymphocyte development.
Borowski C, Li X, Aifantis I, Gounari F, von Boehmer H. Pre-TCRalpha and TCRalpha are not interchangeable partners of TCRbeta during T lymphocyte development. J Exp Med. 2004 Mar 01; 199(5):607-15.