The JEG-3 cell line is a hypertriploid human cell line. The typical chromosome number of JEG-3 cells is 71, with an incidence rate of 34%, and the polyploidy rate is 2.6%. Structural chromosomal abnormalities commonly found in most cells include t(4;11)(p15;q13), i(13q), t(10p15q), del(18)(q21), and six other marker chromosomes. Two additional markers are observed in some cells, and large satellites are present on one N14 and two N22 chromosomes. Chromosomes N2, N5, and N9 have four copies each, while N7, N13, N18, N21, and the X chromosome are single-copy. A single Y chromosome can be detected using Q-band staining.