The cDNA fragment was inserted at the SalI-NotI site of the pBluescript II SK(+) vector (GenBank Accession No. X52328). The 5' end of the cDNA was repaired and ligated with the SalI adapter (5'TCGACCCACGCGTCCG3') and inserted at the SalI site of the vector. The 3'end of the cDNA was inserted at the NotI site of the vector. The adjacent sequence to the 3' end of the cDNA is as follows: GCGGCCGCCC(T)15-3' end of cDNA.