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Ion-mobility spectrometry (IMS) analysis of a crude glycan digest (still containing peptides, proteins, etc.) of the human immunodeficiency virus protein gp120. (a) The total drift scope. (b) An electrospray ionization mass spectrometry (ESI MS) spectrum. (c) The glycans after an IMS separation. (d) A matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) profile of this protein. Modified from Reference 105.
