Blood will be obtained via peripheral venipuncture. The blood will be divided into components (e.g. plasma, serum, microvesicles, and cells) then analyzed. Flow cytometry will be used to determine cell and microvesicle subsets. RNA will be extracted from the various components of blood and will be subjected to gene and microRNA profiling to determine gene expression. DNA will be isolated from the cells to be used in studies investigating epigenetic regulation of genes identified in the screens. Protein will also be isolated from the multiple components to examine the impact of genetic regulation by epigenetic mechanisms or microRNA on protein expression. Peripheral blood mononuclear cells will be placed in tissue culture for study.