− | **Osteoblasts, osteocytes, chondroblasts and chondrocytes are derived from stromal fibroblastic system; osteoclasts from haematopoietic system | + | **Osteoblasts, osteocytes, chondroblasts and chondrocytes are derived from stromal fibroblastic system ('''osteoprogenitor cells); osteoclasts from haematopoietic system |