If this research proves the same in humans as in mice, which of the following will be true?

If this research proves the same in humans as in mice, which of the following will be true?

In the small intestine, neural cell death occurs, but neurogenesis does not.

In the small intestine, neither neural cell death nor neurogenesis occur.

In the small intestine, neurogenesis occurs, but neural cell death does not.

In the small intestine, both neural cell death and neurogenesis occur.