Putative surfactant protein.
Subcellular locations: Secreted, Cytoplasmic vesicle, Secretory vesicle, Golgi apparatus
Predominantly expressed in lung, where it is detected in type II pneumocytes in the alveolus, and in nonciliated epithelium in bronchioli (at protein level). Also detected at lower levels in cervix, esophagus, stomach, testis and kidney.