ST3 beta-galactoside alpha-2,3-sialyltransferase 3 MGLLVFVRNL LLALCLFLVL GFLYYSAWKL HLLQWEEDSK YDRLGFLLNL DSKLPAELAT KYANFSEGAC KPGYASALMT AIFPRQSDQS HLVSHQRVPP DPCLGQPPLP PLHHRGQWRR SCQQVSGVTN