By using somatic cells in which only one or two genes among the three kinds of the gene Oct3/4, Klf4, and c Myc are expressed, the other gene products which can function as {TAIL ~ a nuclear reprogramming factor} can be identified by, for example, performing screening for a gene product which can induce nuclear reprogramming of {HEAD ~ said cells} 
By using somatic cells in which only one or two genes among the three kinds of the gene Oct3/4 , Klf4 , and c Myc are expressed , the other gene products which can function as { TAIL ~ a nuclear reprogramming factor } can be identified by , for example , performing screening for a gene product which can induce nuclear reprogramming of { HEAD ~ said cells }
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