Normally these wane with age but the older adults who had been doing strength training boosted their mitochondria levels similar to those seen in younger men and women."

Source: https://www.dailypost.co.uk/news/uk-world-news/michael-mosleys-gives-listener-three-26897464

Some argue that gaining mitochondria was the defining event in eukaryogenesis.

Source: https://www.wired.com/story/primitive-asgard-cells-show-life-on-the-brink-of-complexity/

While the difference may look subtle at first glance, the sharper image offered by RESORT can be of great benefit to researchers identifying and labeling components of cells, such as mitochondria.

Source: https://phys.org/news/2023-06-imaging-technique-based-photoswitchable-raman.html