Scientists in China announced this week that they've successfully made five clones of a gene-edited monkey to aid in researching a number of conditions relating to circadian rhythms. The idea is that having a group of five genetically identical monkeys will help remove variables in research, but the whole experiment raises some rather murky ethical issues as well.
Researchers at the Institute of Neuroscience (ION) of Chinese Academy of Sciences (CAS) in Shanghai intially gene-edited a group of monkeys to make it more prone to disorders that stem from circadian rhythms. Because of this gene editing, the monkeys "exhibited a wide-range of circadian disorder phenotypes, including reduced sleep time, elevated night-time locomotive activities, dampened circadian cycling of blood hormones, increased anxiety and depression, as well as schizophrenia-like behaviors." The researchers then used fibroblasts (connective tissue cells) from one monkey in that groupto produce the five clones using the same technique that successfully produced the first primate clones in early 2018.