Monocytes were purified for gene expression analysis at weeks 0, 6, 12, and 18 (washout). Blood was collected in EDTA tubes and peripheral blood mononuclear cells (PBMC) separated by Ficoll-gradient centrifugation. CD14+ monocytes were then isolated by negative selection with antibody-conjugated magnetic beads according to the manufacturer's instructions (Miltenyi Biotech), suspended in RNAlater (Ambion), and frozen at −80°C until RNA extraction. FACS analysis was done on each isolation and based on CD14+ staining, mean monocyte purity was 93% (range: 92%-94%).
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