VITRIYANNA MUTIARA YUHENDRI. NIM. 2110247804. The Effect of Vitamin D Preconditioning on Biological Characteristics and Expression of Tumor Necrosis Factor-α, Interleukin-6, Vascular Endothelial Growth Factor in Mesenchymal Stem Cells. supervised by Arfianti and Ismawati. Background: Mesenchymal stem cells (MSCs) have great potential in regenerative medicine applications. Vitamin D has immuno…