Abstract: The present invention relates to a method for evaluating the state of cell differentiation during the process of inducing differentiation of human induced pluripotent stem cells (iPS cells) into retinal pigment epithelial cells. The present invention further relates to a method for evaluating the state of cell differentiation during the process of inducing differentiation of human embryonic stem cells (ES cells) into retinal pigment epithelial cells.

Abstract: Disclosed is a method for evaluating if there are genomic abnormalities in cells being tested, the cells being tested being pluripotent stem cells cultivated in a culture medium or cells resulting from the induced differentiation of pluripotent stem cells, the method including a step of measuring the amount of an indicator present in the culture supernatant of the test cells, and a step of evaluating, on the basis of the amount of the indicator present, if there are genomic abnormalities in the test cells, wherein the indicator is at least one selected from the group consisting of deoxycytidine, kynurenine, putrescine, alanine, cysteine, cystathionine, and threonic acid, and whether or not there are genomic abnormalities in the test cells is evaluated on the basis of the amount of the at least one indicator present.