Modified (flattened) osteoblasts become the lining cells that form a protective layer on the bone surface.
Bones protect internal organs, such as the skull protecting the brain or the ribs protecting the heart and lungs.
Most of the bones of the skull are flat bones, as is the sternum.
Can I make money recommending/selling your bone broth?
These same compounds also increase secretion of macrophage colony-stimulating factor by osteoblasts, which promotes the differentiation of progenitor cells into osteoclasts, and decrease secretion of osteoprotegerin.