Rhonda Patrick· PhD
Well, I mean, they're both. I mean, you know, you'd have to think about they're both just coming from this one cell, which is, you know, when you get this one egg cell, get sperm, boom. Here we go. That's it. That's the one that's the ultimate embryonic stem cell. You start at one cell. And that one cell, obviously, in time, becomes a lot of cells, and part of these cells become your placenta and part of these cells become your fetus.