However, when we begin school and eventually when we get to college, in college, we have to choose our major. And once we choose our major, we basically determine the pathway that we're going to follow. And that pathway will eventually lead us to a certain type of career. And in an analogous way, at the early stages of life, at the early stages those cells are totipotent. They can become any cell whatsoever. But as the process of development continues, eventually cell determination takes place.