Phytohemagglutinin, the glycoprotein lectin of the common bean, Phaseolus vulgaris, has both high-mannose (Man(8-9)GlcNAc(2)) and modified oligosaccharide side chains. The modified side chains have glucosamine, mannose, fucose, and xylose in the molar ratios 2:3.8:0.6:0.5, and are resistant to