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Previous studies have suggested that 1,25(OH) 2 D 3 , the active form of vitamin D 3 , may increase the survival of bone-forming osteoblasts through an inhibition of apoptosis. On the other hand, vitamin D 3 has also been shown to trigger apoptosis in human cancer cells, including osteosarcoma-derived cell lines. In the present study, we show that 1,25(OH) 2 ...