Study 1:

Researchers at harvard changed regions within mitochondria in humans and mouse cells. Mouse cells produce protein faster through mRNA translation than human cells while embryos develop at different speeds between species.

Lazaro et al, 2023, A stem cell zoo uncovers intracellular scaling of developmental tempo across mammals. Cell Stem Cell https://doi.org/10.1016/j.stem.2023.05.014

Study 2:

WIth a lot more going on than just ATP production, study suggests mitochondria's role in timing of nervous systems.They discovered Mitochondria is as pacemaker of speed of development in cells

Ryohei Iwata et al. ,Mitochondria metabolism sets the species-specific tempo of neuronal development.Science379,eabn4705(2023).DOI:10.1126/science.abn4705