ST3 beta-galactoside alpha-2,3-sialyltransferase 3 MGLLVFVRNL LLALCLFLVL GFLYYSAWKL HLLQWEEDSN SVVLSFDSAG QTLGSEYDRL GFLLNLDSKL PAELATKYAN FSEGACKPGY ASALMTAIFP RFSKPAPMFL DDSFRKWARI REFVPPFGIK GQETSLLCLQ TI