... major protein component of plantcell wa lls [8]. They are rich in hydroxyproline but also in serine, lysine, tyrosine, and valine residues, and theycontain arabinose and galactose in the attached ... threonine or histidinerather than serine, and hence they are called threonine-or histidine-hydroxyproli ne-rich glycoproteins (THRGPsor HHRGPs) [32]. Moreover, extensins of dicots arehighly glycosylated, ... s of 3,4-DHP and immunomodulation byJIM11 antibody on the embryonic growth as well asregeneration and germination capacities of embryos wereexamined. Hyp synthesis was inhibited by 200 μMof3,4-DHP...