May affect the movement of lipids in the cytoplasm or allow the binding of lipids to organelles. Widely expressed; the highest levels are found in lung, thymus, pancreas, placenta, adult brain and prostate; also detected in spleen, liver, kidney, colon, small intestine, uterus, spinal cord, adrenal gland, salivary gland, trachea, mammary gland, skeletal muscle, testis and fetal brain and liver. Belongs to the apolipoprotein L family.