It was identified in AD 37 APP/Aβ glycopeptides with sialylated core-1 like O-glycans attached to Thr(−39, −21, −20, and −13) in a series of APP/AβX–15 glycopeptides, where X was −63, −57, −52, and −45, concerning Asp1 of the Aβ sequence [97]. Here, APP is linked to Alzheimer disease.