A method of manufacturing a mop wherein a cylindrical member is fixed in a groove of a sponge. In the method, the poly-silicon layer is first subject to a plasma pre-process and then a hydrogenating process is undertaken thereon where a hydrogen-containing silicon-based compound is deposited over the poly-silicon layer having being pre-processed by the plasma and thermal treated. By using this key, data is added with copy control information used when the data is recorded initially and thereafter the data is transmitted. Soluble fragments comprising PDGF receptor sequences are also provided, including important intracellular kinase insert sequences which interact with intracellular proteins.