CXCL12 and cardiovascular disorder: Verification of the migration assay in BM cells from subjects without a cardiovascular disease background confirms the depletion of CD3+ lymphocytes and CD34+ and CD133+ PCs along with enrichment of CD14++CD16−, CD14++CD16+ and CD14+CD16++ monocytes in the SDF-1-attracted fraction (Additional file 1: Figure S3).