Hyaluronicacid(HA),alsocalledhyaluronan,isalinearpolysaccharidecomposedo ingdisaccharidesunitsofglucuroni‐acetylglucosamine ﹒ Itexistsinconnectivetissues,synovialfluid,vitreoushumor,umbilicalcord,cartilage。Inrecentyears,greatprogresshasbeenmadeonthestu,fe ......