Tumor onset was significantly delayed in MMTV-PyMT Ccr6−/− mice (Fig. 1c), with some mice not developing palpable tumors until 150 days old (21 weeks) compared to a maximum onset age of 130 days old (18 weeks) for MMTV-PyMT Ccr6WT counterparts (Fig. 1d). The gene discussed is CCR6; the disease is neoplasm.