a large pectic polysaccharide , called rhamnogalacturonan i , that is solubilized by a fungal endo-alpha-1,4-polygalacturonase from the purified walls of suspension-cultured sycamore cells possesses proteinase inhibitor-inducing activity similar to that of the proteinase inhibitor-inducing factor , a pectic-like oligosaccharide fraction isolated from tomato leaves .
C0032594
polysaccharide
C0028959
oligosaccharide