Studies in 2023 investigated what controls the pace of development in mouse and human cells, finding different developmental rates between species.

“And there's two beautiful papers one published in nature one published in science on the same month in 2023 uh that I think shed some light on this They ask what controls the pace of development >> in mice and in humans. And so they took mouse cells, human cells, stem cells, put them in a dish, and then you look for like the rhythm of development. And they found that as others had seen before, the mouse cells, which came from an animal that develops, grows, and dies in three years versus human cells, right? an organism that develops, grows, and dies in like 80-ish years uh uh have very diff different developmental rates.”