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- Identification of the human Lewisa carbohydrate motif in a secretory peroxidase from a plant cell suspension culture (Vaccinium myrtillus L.)Publication . Melo, Nuno; Nimtz, Manfred; Conradt, Harald S; Fevereiro, Pedro S; Costa, JúliaThis paper reports for the first time the presence of the human Lewisa type determinant in glycoproteins secreted by plant cells. A single glycopeptide was identified in the tryptic hydrolysis of the peroxidase VMPxCl from Vaccinium myrtillus L. by HPLC/ESI-MS. The oligosaccharide structures were elucidated by ESI-MS-MS and by methylation analysis before and after removal of fucose by mild acid hydrolysis.