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C. elegans phosphorylcholine oligosaccharides. The top structure is that proposed by Haslam et al. (4). Phosphorylcholine-6-O-substitution is present on up to five N-acetylglucosamine residues. The center structure is the PCO proposed by Cipollo et al. (5). The position of the phosphorylcholine substitutions are unknown, but core N-acetylglucosamine and mannose substitutions are both possible. The bottom structure is the diminimus PCO reported by Haslam et al. (4).
