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Established FGF2 low-dose–dependent Fld-ES cells and their karyotype analysis. (A) The colony was flat and had the features of a primate ES cell colony. (B) The 18 generations of Fld-ES cells. The chromosome number was normal (42). The sex chromosome was XY. (C) About 80% of cells had a normal chromosome number. Scale bar, 100 µm.
