1 ﹒ Sambrook J,Fritsch EF,Maniatis T ﹒ Molecular Cloning:AL aboratory Manual(2nd)﹒ New York:Cold Spring Harbor LaboratoryP ress,1989.7 ﹒ LiangP,PardeeA B ﹒ Differentiald isplayo fe ukaryotic messengerR NAb y means of the polymerasec hainr eac tion ﹒ Scien ......