Probable transcription activator for a number of lung-specific genes (PubMed:8626802). Mediates up-regulation of the E3 ligase IRF2BPL and drives ubiquitination and degradation of CTNNB1 (PubMed:29374064). Interacts with the transcription factors TBP and TFIIB. Lung and placenta (PubMed:8626802). Predominantly expressed in gastrointestinal tract including stomach (PubMed:29374064). Two activation domains, AD1 and AD2, C-terminal of (and distinct from) the forkhead domains are necessary for transcriptional activation.