Secreted cytokine-like protein (PubMed:12847263). Binds to the scavenger receptor MARCO (PubMed:12847263). Can also bind to pathogens including the Gram-positive bacterium L.monocytogenes, the Gram-negative bacterium P.aeruginosa, and yeast (PubMed:12847263). Strongly inhibits phospholipase A2 (PLA2G1B) activity (PubMed:24213919). Seems to have anti-inflammatory effects in respiratory epithelium (By similarity). Also has anti-fibrotic activity in lung (PubMed:24213919). May play a role in fetal lung development and maturation (PubMed:24213919). Promotes branching morphogenesis during early stages of lung development (PubMed:24213919). In the pituitary, may inhibit production of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) (By similarity). {ECO:0000250|UniProtKB:Q920H1, ECO:0000269|PubMed:12847263, ECO:0000269|PubMed:24213919}. This is the function of Ensembl gene identifier ENSG00000164265 (SCGB3A2, secretoglobin family 3A member 2).