Glycans are polyhydroxy aldehydes and ketone polymers formed by the condensation of 10 or more monosaccharides through glycosidic bonds. They are widely present in the cell membranes and cell walls of organisms such as animals, plants and microorganisms. They not only participate in cell recognition, various life activities such as growth, differentiation, metabolism, embryonic development, viral infection, canceration, immune response, and various physiological functions such as structural support, energy storage, defense, etc., are one of the four basic substances that constitute life.
