A well - known breeding technique
called backcrossing has become far more potent recently, as markers have allowed scientists to locate rare offspring that retain only the desired — and now detectable — genes from orphan crops.
(8) Imputation of these results specifically to the animals» age - related, low - BubR1 - driven rise in p16Ink4a - expressing senescent cells was, however, limited: limited by the very nature of so -
called «accelerated aging» models such as BubR1H / H, (9) and limited by the lifelong, global absence of p16Ink4a expression in the
backcrossed mice.