Method of localizing hyaluronic acid to the surface of a cell or multi-cellular structure by contacting the cell or multi-cellular structure with a dispersion of a construct of the structure F—S1—S2-L where F—S1 is a polymer or oligomer of hyaluronic acid including a terminal glycamine residue (S1), S2 is —CO(CH2)4CO—, —CO(CH2)5CO— or —CO(CH2)6CO—, and L is a phosphatidylethanolamine.