Decreased levels of bisecting GLcNAc glycoforms of IgG are associated with human longevity

L. Renee Ruhaak, Hae Won Uh, Marian Beekman, Carolien A.M. Koeleman, Cornelis H. Hokke, Rudi G.J. Westendorp, Manfred Wuhrer, Jeanine J. Houwing-Duistermaat, P. Eline Slagboom, André M. Deelder