Probable transcription activator for a number of lung-specific genes. Expressed primarily in lung in alveolar type II pneumocyte cells, and to a lesser extent in placenta, stomach, intestine and colon. Activation domains C-terminal of (and distinct from) the forkhead domains are necessary for transcriptional activation. It is uncertain whether Met-1 or Met-26 is the initiator. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.