PDL tissues derived from compromised teeth in periodontitis patients and healthy donors were enzymatically digested, obtaining a heterogeneous population of cells (Figure 1A), which contains a small percentage of CD105/CD73/CD90+ CD45- MSCs cells (Figure 1B) along with non-MSCs (CD14, CD19, CD34, CD45+ cells) and for epithelial cells (EpCam1+ cells), data was not shown. This evidence concerns the gene CD34 and periodontitis.