No mitoses were found in unstimulated cultures. No Ph chromosome was observed. So far, trisomy 8 has been described for only two cases of EL, whereas trisomy 7 has never been observed.

A century after Down syndrome was first described, scientists discovered that the root cause of this disorder is a condition called trisomy 21. What strides in research have been made since then?

This shows maternal-age-specific estimates of trisomy among all clinically recognized human pregnancies, generated by combining data from individual trisomies and assuming a spontaneous abortion ...