ST3 beta-galactoside alpha-2,3-sialyltransferase 3 MGLLVFVRNL LLALCLFLVL GFLYYSAWKL HLLQWEEDSS KYSHSSSPQE KPVADSVVLS FDSAGQTLGS GTVTADWNLW WFITMKKGSG SLTTEMPVAC