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Negative ion CID spectra ([M+H2PO4]− ion) of: (a) Man8GlcNAc2 (d1d1d3 isomer, 7, from gp120). (b) Man9GlcNAc2 (26, d1d1d3 isomer with an extra mannose residue at position 6 of the internal mannose of the 3-antenna) from a Saccharomyces cerevisiae mutant (c) Man9GlcNAc2 (d1d1d2d3 isomer (4) and (d) Man10GlcNAc2 (27, d1d1d2d3 isomer with an extra mannose residue at position 6 of the internal mannose of the 3-antenna) from a Saccharomyces cerevisiae mutant.
