N-glycan purification and pyridylamination were performed as described previously16 (link)17 (link). PA-N-glycans were analyzed by HPLC using the following columns: DEAE (TSKgel DEAE-5PW, Tosoh, Tokyo, Japan), NP (Shodex Asahipak NH2P-50 4E, Showa Denko, Tokyo, Japan) and RP (CAPCELL PAK C18 SG120, Shiseido, Tokyo, Japan or Develosil C30-UG-5, Nomura Chemical, Seto, Japan). Additional details are provided in the Supplementary Information.
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