Mitochondrial replacement therapy, involving transferring the nucleus of an older egg into a younger egg's cytoplasm, is being trialed in other countries due to legal restrictions in the United States.

“Another thing we're working on is something called mitochondrial replacement therapy where — basically similar concept you were taking like you have an older woman let's say she under goes IVF you have a donor that undergoes IVF but you take the nucleus out of the older egg and you put it in a younger egg. So essentially the cytoplasm is from the young egg including the mitochondria. So we think part of the aging is just like other aspects of aging, you know, acquired mutations in the mitochondria. So you have young cytoplasm, young mitochondria, maybe those eggs will do better or that nucleus will do better in that young egg. Um, unfortunately, we can't do that in the United States legally, but we're we're doing trials in other countries.”