A platform of different human glyco-engineered cell lines is available which offer different possibilities to optimize glycosylation. mAbExpress and mAbExpressF- belong to the GlycoExpress platform and enable an optimized glycosylation of antibodies, including high (mAbExpress) or lacking core-fucosylation (mAbExpressF-, ADCC enhancement), high galactosylation, bisGlcNAc and sialylation. SialoMax is used for products where high sialylation and high core fucosylation is required. Additional two GEX cell lines SialoFlex and FucoFlex are available allowing gradual adjustment of the sialylation (SialoFlex) or fucosylation (FucoFlex) degree for screening of the optimal content of sialic acid or fucose on a protein.