Dr. Jing Qu (R), team leader for Stem Cell and Ageing group, and Dr. Wei Wang discuss the work on genome-wide screen for novel ageing regulatory genes in human stem cells at the cell culture room of the Aging and Regeneration lab at the Institute for Stem Cell and Regeneration of the Chinese Academy of Sciences (CAS) in Beijing, China, January 12, 2021. Picture taken January 12, 2021. REUTERS/Tingshu Wang