Abstract The sections in this article are Introduction β1,2‐N‐AcetylglucosaminyltransferaseI β1,2‐N‐AcetylglucosaminyltransferaseII β1,2‐Xylosyltransferase Core α1,3‐Fucosyltransferase Lewis a TypeGTs: α1,4‐Fucosyltransferase and β1,3‐Galactosyltransferase Conclusion and Future Perspective Acknowledgements