In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 We show in this study , using TCF - 1 beta ( 2 ) - microglobulin double - deficient mice , that these repertoire alterations are not due to Ly - 49 / MHC class I interactions .
TCF - 1