APTS-labeled N-glycans from standard glycoproteins (see Section 4.5) spiked with APTS-labeled maltodextrins or dextrans, and several stem-cell-derived N-glycan samples containing OSIs, were treated with GAP or DxChe as described in Section 4.4. using disodium phosphate-citrate buffer at pH 5 for 30 min.
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