該基因編碼與主要組織相容性復合體（MHC）I類重鏈在幾乎所有有核細胞的表面上發現的血清蛋白。這種蛋白主要是β-折疊片結構，在某些病理條件下可以形成淀粉樣纖維。編碼的抗菌蛋白在羊水中顯示出抗菌活性。這種基因的突變已被證明導致高凝性低蛋白血癥。
This gene encodes a serum protein found in association with the major histocompatibility complex (MHC) class I heavy chain on the surface of nearly all nucleated cells. The protein has a predominantly beta-pleated sheet structure that can form amyloid fibrils in some pathological conditions. The encoded antimicrobial protein displays antibacterial activity in amniotic fluid. A mutation in this gene has been shown to result in hypercatabolic hypoproteinemia.