We did note, as reported elsewhere [4,5] a difference in the ability of EMT6 and EMT6siCD200 tumors to metastasize to DLN in CD200-/- vs WT mice (Fig 1C), with even control EMT6 metastasizing less in CD200-/- mice, indicating an importance for both host and tumor CD200 expression in this phenomenon. Here, CD200 is linked to neoplasm.