Using this approach, we found no significant difference between MMTV-PyMT Ccr6WT and Ccr6−/− tissue in the ability to form outgrowths when transplanted into Ccr6WT recipients (Fig. 4e), indicating that the deletion of CCR6 did not reduce the tumor-propagating capability of mammary epithelium. This evidence concerns the gene CCR6 and neoplasm.