- Addition of beta1-6 GlcNAc branching to the oligosaccharide attached to Asn 772 in the serine protease domain of matriptase plays a pivotal role in its stability and resistance against trypsin. Ihara, S., Miyoshi, E., Nakahara, S., Sakiyama, H., Ihara, H., Akinaga, A., Honke, K., Dickson, R.B., Lin, C.Y., Taniguchi, N. Glycobiology (2004)