Osteoblasts are like a cartilage precursor too, right? It's not like our cartilage. So they were chondrocytes and then that osteoblasts migraine changed the form into more bone-like. Which then is interesting because if you look at bones before they're made, they were cartilage before bones, mostly,. Right? Like, most- Yeah, but they're like a carteal precursor too,right? Yes. And so it's interesting that that kind of has its own kind of differentiation or change between these two specialized groups. Then we have further groups, right? Three. We've had a highland. That's at the end of the