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.

 The association of trans - acting T cell factors ( TCFs ) or lymphoid enhancer factor 1 ( LEF - 1 ) with their coactivator beta - catenin mediates transient transcriptional responses to extracellular Wnt signals .
LEF - 1