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