Fiber blasts are the main immature cell type for many connective tissues. They make those fibers and the gels we're going to talk about shortly. Osteoblasts, what's that? Bone. Condro blasts. Hemosidoblast. Erythra sites. Red blood cells. White blood cells. And obviously others, but there we go. Mature. Highly attractive. Quiescent. Which means kind of retired. Yeah. Not too active anymore. ...Which is what I plan on doing when I retire. Okay. So let's... Or they've locked themselves into a space they can't get out of. Yes.