Osteoblasts. They make a protein mixture known as osteoid which mineralizes to become bone. These osteoids are primarily composed of Type I collagen.
Osseous tissue, it's main constituent is collagen (type I collagen to be precise) produced by fibroblasts. Along with associated molecules (calcium, phosphorous and magnesium ions). Osteoblasts are the cells that move over bone tissue to deposit these molecules and crystalise them, including collagen Type I, together to form the bone mineral (a collagenous matrix structure) NB, collagen is a protein synthesised in the body by fibroblasts. Source: Medical biochemist
Generally, collagen type of skin is type I collagen
fibroblasts are the most common resident cells in ordinary connective tissue. Fibroblasts are responsible for secreting collagen and other elements of the extracellular matrix of connective tissue.fibroblasts
Osteoclast
TO PRODUCE SEX CELLS involved in the production of offspring
Cells with chloroplasts.
Adult stem cells
Collagen in skin, fingernail and bones is type 1. Collagen from articular cartilage is type 2. The gelatin you buy in the supermarket is type 1. Although I could find no clinical trials, there are lots of personal reviews crediting type 1 with improving osteoarthritis symptoms. Type 2 is much more expensive than type 1. And it has clinical trials with successful rheumatoid arthritis treatment.
Adults.
Adult
Adults.
Adult stem cells