You can try to press the ESC key to deselect the copiedcell and then try to copy again.
您可以尝试按esc键取消复制的细胞，然后尝试再次复制。
2
Histones also play a role in turning genes on so that their coded instructions can be copied and sent to other parts of the cell.
组蛋白还起到了基因开关的作用，因此它们编码的信息可以被复制并且传递到细胞的其它部位。
3
Blackburn and Szostak determined that it was a specific DNA sequence in the telomeres that kept chromosomes from fraying whenever they were copied when a cell splits in two.