The Table shows ratios of peak heights of mutant C. elegans N-glycans relative to peak heights of wild-type N-glycans after MALDI-TOF MS analysis. Normal structures which are absent in the mutant worms (ratio=0/X) are shown in bold type. Structures seen in the mutant but not in the wild-type worm (ratio=Y/0) are shown in italics. The hexose residues in Hex2–Hex9 are probably mannose residues, but the presence of some galactose cannot be ruled out [45,46]; Hex10 is presumably Glc1Man9. Abbreviations: F, L-fucose; Me, O-methyl. Hex3GlcNAc3 and Hex3GlcNAc4 probably represent truncated mono-antennary and bi-antennary complex N-glycans respectively.