It is intended to provide a method for easily detecting a phosphorylated peptide in a test sample by using SDS-polyacrylamide gel electrophoresis which has been conventionally employed in analyzing a protein; a polyacrylamide gel for electrophoresis to be used in the method; a method of producing the gel; and a synthesizing intermediate in producing the gel. The film-forming composition is one for forming a protective film which in the diffusion of an impurity into a silicon wafer, serves to partly prevent the impurity diffusion. The tube assembly is frictionally disposed within the inner passageway of the tubular retainer. Prior to segmenting, the framing unit surrounds a partial region of the display region of the display unit. This is achieved according to an embodiment by mapping the SIR value to a CQI value based on an indication of the expected transport block size to be received by the receiver.