Sequence controlled polymers are defined as macromolecules whose monomer arrangements are in precise order.In traditional copolymers the distribution of monomers is usually uncontrolled or statistically controlled.In natural polymers such as proteins,the primary sequence of proteins is polypeptides,which is synthesized using 20 amino acids as building blocks.Additionally,the order/arrangement of amino acids in polypeptide chains direct the folding information,which guides the polypeptide to fold into defined secondary/tertiary structures to achieve specific functions of proteins.