“ Soon after Harris’s HeLa-chicken study, a pair of researchers at New York University discovered that human-mouse hybrids lost their human chromosomes over time, leaving only the mouse chromosomes. Thi… Rebecca Skloot
“ Only cells that had been transformed by a virus or a genetic mutation had the potential to become immortal. Rebecca Skloot
“ They also knew that there was a string of DNA at the end of each chromosome called a telomere, which shortened a tiny bit each time a cell divided, like time ticking off a clock. As normal cells go th… Rebecca Skloot
