Abstract
The presence of calcium (GBHA technique) in the periosteal cells, osteoblasts, osteocytes and chondrocytes of developing chick embryo bone confirms the findings ofKashiwa (1966) in the rat. Modification of bone development by tetracycline administration indicates that there is a direct correlation between the amount of calcium within these cells and the degree of mineralization of the adjacent matrices. The calcium of the calcification front of bone and the abnormally calcified cartilage matrix resulting from tetracycline treatment appears to differ from that of the older bone and normally calcifying cartilage matrix in its ability to chelate with GBHA. The distribution of the GBHA positive material appears to correspond to that of a pyridine-resistant bound lipid previously reported.
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