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Morphologic analysis of HL-60 cells treated with PT alone or in combination with 1,25-(OH)2D3. HL-60 cells were treated for 72 h with vehicle control (A), 10 μM PT (B), 5 nM 1,25-(OH)2D3 (C), or 10 μM PT plus 5 nM 1,25-(OH)2D3 (D). Cytospin slides were made from HL-60 cells (5×105 cells ml−1) and were stained with Giemsa stain.
