Abstract: The present invention provides a screening method for somatic cell nuclear reprogramming substances, which comprises (a) a step for bringing into contact with each other a somatic cell comprising a gene wherein a marker gene is present at a position permitting expression control by the expression control region of an ECAT gene, and a test substance, and (b) a step following the aforementioned step (a), for determining the presence or absence of the emergence of cells expressing the marker gene, and selecting a test substance allowing the emergence of the cells as a somatic cell nuclear reprogramming substance candidate, and the like.

Abstract: The present invention relates to a probe for selecting ES cells, which characteristically contains one of DNAs having base sequences depicted in SEQ ID Nos; 1, 2, 3, 4, 5, 6, 7 and 8, or DNAs having base sequences depicted in SEQ ID Nos; 9, 11, 13, 15, 17, 19, 21, 23 and 41 and a screening method of ES cell using this probe. Preparation of a probe for selecting ES cells becomes feasible by identifying plural gene with ES cell-specific expressions (ECAT genes) and using the information of the base sequences of these gene groups. Efficient selection of ES cell enables supply of a large amount of ES cell expected to be applicable to regenerative medicine.