Biosynthesis of globo-series glycosphingolipids. Gb3, globotriaose; Gb4, globotetraose; SSEA3, stage-specific embryonic antigen 3; SSEA4, stage-specific embryonic antigen 4; β3GalNAcT1, β1,3-N-acetylgalactosaminyltransferase 1; β3GalT5, β1,3-galactosyltransferase V; ST3Gal-II, β-galactoside α2,3-sialyltransferase; FUT-1, fucosyltransferase-1; FUT-2, fucosyltransferase-2.