Scientific illustrations indistinguishable... from «Limitations of serial cloning in mammals» https://doi.org/10.1038/s41467-026-69765-7 > Scientists in Japan cloned mice for 58 generations. In other words, they cloned a mouse, took a cell from that cloned mouse, and repeated this again and again for 20 years. > Clones were healthy through ~generation 28, but then the viability started to drop off.