Arabinogalactans are polymers composed of arabinose and galactose monosaccharides. They exist in plants as free glycans or are attached to rhamnogalacturonan I or to protetein backbones. When attached to proteins they form arabinogalactan protein (AGP) which works as an intercellular signaling molecule. AGP also functions as a glue for sealing wounds in plants. Arabinogalactans can be used as an additive in food, and as a replacement for starch in food or pharmaceutical products. This pectic polysaccharide antibody belongs to the arabinogalactan-4 group of antibodies. Pectin consists of polysaccharides found in the primary cell wall of most plants which binds cells together in the middle lamella.
